Boy let me tell you one thing: Do not even go NEAR anything like Republic Bike if you know what's good for you. Stay away from Bigshot Bikes, Republic Bike, Pure Fix Cycles, Retrospec, Aerofix, or basically anything made out of Hiten (high tensile steel) and has no-name parts. Hiten steel is super heavy and even rusts in some cases. Stay away from Projekt Fixie, their parts are junk. My friend just got a seatpost from them about a month ago and I s**t you not: just two days ago he tried hopping over the curb with his fgfs and when he landed, he accidentally sat back down. So basically, the seatpost just crumpled under his weight plus the added pressure of him landing on the seat the wrong way. Also state bicycle co is ok, some people have just had bad experiences with them in the past. They literally JUST started making their bikes with chromoly so my guess is the people who ordered the in the past were mad they were made out of hiten so they hate state. The other thing about state is their basic stock bikes are made out of crappy no-name parts unless you choose to spend a bit more and get some nicer parts. I would suggest a few things:
1. Get a vintage road frame and build a custom fixie off of that using parts from the spare parts/old parts bin at you lbs (local bike shop)
2. Get a Mercier Kilo TT and slowly customize it to your liking. The Kilo TT does have no name parts, but the parts are actually decent. I'm pretty sure they're made of aluminum.
3. Get a State Bike co. "contender" model and spend a little extra $ to get the optional good parts.

Also, one last thing. PLEASE USE BREAKS!!! The dumb idiot who doesn't put breaks on his fixie just because he thinks it looks cool is always the one who ends up getting his face on the front page because he was too cool for breaks. If you can skid or skip stop that's great, but you should still have a safety break. Don't skid all the time too because it wears down your tires and you'll end up buying a new set every 3 weeks.

Good luck and happy riding!