Hi,

Blah blah blah it's not just a product like buying a fancy watch, it's a bunch of mechanical parts that have to be assembled, tuned-up and maintained properly if you want to enjoy your bike.

Aside from the fit of the bike (stem swap for proper fit should be complimentary) and budget constraints (don't break the bank if this is your first fixed gear bike - to be honest, you don't know what you really want right now so don't spend more than what it takes to get you out and riding) you should feel really comfortable with whoever sells you the bike. If you're getting slick sales pitch or it's somewhere with THE LOWEST PRICES IN TOWN!!! consider how they're still making money on the bike (answer: cutting labour times and not building the bike up properly to begin with). This is tough when you're shopping for literally the cheapest options available but try to do your homework and buy from some place where they'll treat you right as a customer. Even if you're looking at entry-level stuff you should still be respected for the hundreds of dollars you're willing to shell out.

That being said, if you buy a bike for that much money and the shop actually does a good job on it for you, PLEASE buy some more parts/accessories from them and go back there for some service so they can actually make a bit of money.