May I suggest you send me the $600 and I will help you build one?
On a more serious note I think most people will tell you to build your own. Not only will it be cheaper but you won't be limited by someone else's idea of what you need from your system. There's alot of good information on these boards and some pretty good people too should you get stumped just give a call out. The sky really is the limit on what you can hope to ACHIEVE.
Welcome to the board.