With a huge budget like that you have a tonne of options. I'd definitely spend some money to travel to different dealers like savage guitars, etc. where you can find a wide spectrum of instruments to play them in person. There are good recommendations here, but you'll never really know for yourself until you try. You probably don't want to spend 12-15k buying blind, so you either need to try in person or have a good return policy in place. Whatever you choose to do I would bear these things in mind:
-focus more on the sound/playability than the price, maker, etc. You may be surprised to find that the instrument that speaks to you most falls well under your budget and outperforms guitars at a higher price point. Pricing can be so subjective and deceptive in the CG market. One sometimes makes the wrong assumption that a 15k guitar will give you 3x more performance than a 5k guitar, which simply is not the case.
-Bring someone with you. Since volume is important to you and you need others to hear you in your ensemble, you need to hear the guitar from the listening end from various distances. In my trips to dealers I've discovered how deceptive "loud" guitars can be. It is totally possible for a really loud double top to have about the same or less projection than a fan braced instrument.
-An important question is how much volume is really needed to play in an ensemble? Is it really necessary to have monster volume, or is it just a preference? Is everyone else in the ensemble playing super loud instruments? Personally I think one can do just fine with an instrument of decent dynamic range. I would certainly still prioritize tonal quality/beauty and clarity over volume in that situation.
"Success grants its rewards to a few, but is the dream of the multitudes.
Excellence is available to all, but is accepted only by a few." - Christopher Parkening