Welcome to the Gang! You've come to the right place...
As others have said, buying used is usually the best way to go until you have really settled on a particular style. Why? Because bows are like clothes, everyone has a particular shape that suits them best and then there is the color / wood choices just to name a few of the variables.
But buying on a budget as yours you have many options than you might realize. Sponsors like Rocky Mountain Specialties, The Footed Shaft all sell used bows. In addition, one of the best ways to buy a bow is to go to some of the shows and shoots like (Comptons or Kalamazoo). There you can try all of the bows before you buy. Go to the calendar section of this website to see what's going on near you.
Even if you are not able to make it to a show or shoot, contact your nearest club and pay them a visit. The traditional folks are usually the most friendly and willing to show you their equipment. Maybe they won't let you actually shoot their bow (due to your size, etc.), but you can see all of the combinations in woods, grips, etc.
Lastly, all of the bowyers you mentioned and more are extremely helpful and accomodating. In this business people don't last very long if they aren't! Each of them have a great reputation and a lot of experience with newbies and old timers alike. If you are sure that you want a custom built right away, do as you are and talk to them. One or more will strike you as the "one". I am quite certain that you won't be dissapointed with any of them.