What frame and forks should I look out for?

Fixedgearfilter: I'd like to build a single speed bike, but I have no idea what frame and forks to buy. I recently went to San Francisco and while out there I was surrounded by Fixed Gear bikes and they were awesome. I currently ride a 1950s single speed Schwinn and would prefer that setup to an actual fixed gear. But since I've only ever ridden cruisers and bmx bikes, I don't know what frame and forks to buy.

So... I'm 6ft tall and I need to know what kind of used bicycle would make a suitable donor for a frame and what size it needs to be roughly. I'd also prefer straight forks so recommendations for those would be amazing. I won't be using lever brakes so the smoother the frame the better!

Thanks in advance...

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