Um, just food for thought -
If you haven't played that many guitars yet, is it REALLY such a good idea to spend a lot of cash on a custom?
To me, the appeal of a custom guitar was to buy something really unique, that fits your exact needs and desires as a player. You're paying top dollar for a guitar that, as a custom to YOUR specs, won't have the greatest resale value. So, does it really make that much sense to have a guitar built to your exact specs, if coming into the project you don't have these specs already in mind?
My vote would be to wait until you have the 7620 (you're the same guy at www.sevenstring.org
who just posted a "willing to buy 7620 for a custom project" thread, right?), and then play it for a couple months before you decide anything else. While doing this, go out and play every single guitar you can get your hands on, and look for common trends on the guitars you like and those you don't. after a couple years of this, you won't have to post a thread here asking what you should have for your custom, because you'll already know.