I have been experimenting with different strings for a while and thought I would post my perceptions of them in case it might help others. I have learned a lot by reading what others have had to say and this message serves as a feeble attempt to give a little back. I am an experienced guitar player but relatively new (last year or two) to playing classical. My guess is that I am an advanced beginner to weak intermediate. The guitar I play is a Cordoba C9 with a cedar top. I have left each set of reviewed strings on for at least a month, most of them longer, and I am listing them in the order I tried them. Intonation on all of them up and down the neck was great. It is never easy describing sound, but here goes...
1) Savarez 500CJ - bass strings are bold sounding and do not feel very stiff considering their published tension, treble strings are loud, punchy, percussive, bright, and perhaps a bit cold sounding.
2) D'Addario EJ44 - bass strings are warm and deep, not very loud, and slightly floppier feeling that the 500CJ, treble strings are warm, a bit thuddy, and not very loud.
3) Savarez 500CR - bass strings are bold/bright sounding and just a little less stiff feeling than the 500CJ, treble strings are also less stiff feeling than the 500CJ and a bit less percussive. Overall, these strings sound a lot like the 500CJ with less tension and not much perceptible loss in volume.
4) La Bella 2001 Hard - bass strings are warm, feel floppy compared to any of the above sets, and are a bit dull sounding even when fresh, treble strings are bright but less cold sounding than either Savarez set. Very musical sounding to these ears.
5) D'Addario EJ45 - bass strings are deep sounding but have a nice punch and brightness to them when needed. They are maybe just a bit stiffer feeling than the La Bella's, but easier to fret than the other sets, treble strings are warm, velvety, and sweet sounding (similar to the La Bellas), but are also punchy when needed with some brightness. Also, more than any other trebles, these seem dynamic in that can be quite quiet or loud when you dig in. The Savarez sets were the opposite by comparison, loud but not much variation in volume whether you played gently or hard. The EJ45 are still on the guitar. Overall, they are my favorite so far.
6) Augustine Classic Red - bass strings are warm and smooth sounding, not as bright or punchy as the EJ45 or Corum, the Classic trebles are a bit firmer feeling that the EJ45 and are very sweet sounding with a bit more brightness than the EJ45, but not as bright at the Cristal trebles, The Classic trebles sound great with vibrato and sustain better than any other sets I have tried. To date, they are my favorite trebles by far, though I prefer the EJ45 basses.
6) Augustine Classic Blue - bass strings feel noticeably stiffer/firmer than the Red basses, and squeak a lot more. They might have a bit more punch than the Red basses, but they are not as bright or punchy to these ears and the EJ45 or Corum. Smooth and deep tone with not a lot of definition, like the Red basses. I already commented on the Classic trebles (above).
7) Augustine Imperial - these treble strings sound a bit pingy/metallic to my ears and are percussive. They are not as sweet sounding as the Classic and do not have as much dynamic range (soft to loud volume) as the Classic. They feel and sound a lot like Savarez Cristal, but perhaps not quite as bright.
Please excuse emoticon. One cannot type an 8 and closed parenthesis without getting it. Savarez Cantiga (NT) - soft feel under the fingers, perhaps a bit softer than EJ45. They have a warm tone with decent punch and are articulate especially on the higher frets. I might try these in higher tension in hopes of getting more depth/boldness.
9) EJ45C - tried the bass strings only. I found these to be deep and powerful sounding, but also with good definition/clarity. They feel close in tension/stiffness to the regular EJ45 basses, but sound a little different. The D string feels a bit thicker and higher tension on the EJ45 set than the EJ45C set, which I like.
10) Savarez Alliance - These are my least favorite treble strings of all that I have tried (see above). They sound a bit like steel strings to me and lack complexity/sweetness. Having read about them I also expected them to be much louder than the nylon trebles that I have used, but if they were louder it was not by much. I might use the G string along with my preferred strings (see below) as the increased focus is nice. However, on some pieces I play I miss the sweetness/depth/complexity of the Augustine Classic G.
EJ45 or EJ45C basses (not sure which I prefer) with Augustine Classic trebles remain my favorite combination. I am very happy with the tone, sustain, vibrato, volume/dynamics (can play softly but can get loud if I did in on the Classics), intonation, feel, and longevity of the strings, but will keep experimenting. Also, I hope that I will continue to improve and that my preferences might change as this happens. Thank you all for your suggestions, and feel free to keep them coming. I appreciate it.