This is now established as a massive market, A huge range of frames, wheels rims handlebars and cranksets are available.
I can cover most, if you dont see you can ask me.

I keep Velocity, Rigida DP18, Ambrosio,Halo,H Plus etc

As wheel builder I have built many fixed gear sets on many different hubs. and i have found through experience the best wheels are 2 cross or 3 cross patterns radial etc look great but dont last

Hubs Royce,Goldtec,Phil,White industries,BLB,Suzue,Ambrosio,Zenith,
Miche

I use spokes according to budget, I Use ACI Sapim & DT Swiss.
If you break a spoke I will replace fro free.

I use brass nipples where required and alloy and anodised are available on request and at extra cost