First fixed bike build thread - Help build my first singlespeed or fixed bike

I agree with the rest that steel is the way to go, you will love it. If you can afford it get a track frame, but a road frame with short clearance will do, too.

In terms of drivetrains, Sugino is very popular.

I agree here also. Steel, especially if it is your first built bike. You can always upgrade once you have more of an idea of what you like and don't like.

Sugino has a messenger crank set that I actually just got for my new bike. They even have colours, I am not going to lie, mine is pink =)

You also mentioned velocitys. Go on ebay. They have hundreds of wheel sets super cheap but made with decent parts. It is definitely worth your time to look. I saved over $175 on my wheel set this way.