Hi Onion. Let us know what bike you choose!
The link Absntr posted is actually pretty good for pre-made bikes.
Re-read the first couple posts, it mentions several.

Also, check the ebay thread- fixed gear bikes are sold there most of the time.

The most important thing is finding a bike that FITS you. I've had several and when I sit on different bikes it is a total different experience- my butt hurts less, my arms feel great and I'm not straining to look ahead.

http://www.peterwhitecycles.com/fitting.htm

Are you doing this on the cheap, or spending cash? If you have got some cash to think about, perhaps pay for a fitting in a bioke shop (around $60) to help you figure out what fits you best.

Don't have the money? Research bike fitting, buy a $25 geared clunker that is close to your size, fiddle around with the saddle height, saddle angle, handlebar heighth.. THEN go out and buy a fixie off the shelf.

I guarentee it will make a lot of difference.

Also, not sure how tall you are- but I'm starting to realize I might need a wider handlebar. I'm 6'2" and a small handlebar seems to be a bit small. My handlebars are 36cm and it is looking like I need ones that are 43cm. Just a thought.

Definatly let us know what you get.