This is one of the weirdest posts I have seen in a while. THe OP claims to work at a shop (I don't believe it), but knows relatively little about bikes/ bike culture. I am calling troll, but I'll bite anyway.
1. Just because you work in a shop doesn't mean that everything in the bike universe is available to you at some sort of discount. Why not start by looking at what your distributors carry?
2. If the shop you are at is anything like my old shop, if the master mechanic gets wind of something like this (trying to build a fixie for use at the 'drome and also for tricks), you could be in for an earful.
3. How much do you know about doing tricks on a fixie? How much do you know about velodromes? I will admit that i know nothing about tricks, but as others have mentioned, lots of the things you are describing are not track legal.

Please go back and retitle this: "I have more money than sense, help me spend it!"