I'm very eager to build a single speed for my daily commuting and especially to challenge myself to ride in next year's MS 150 and other charity and multi-day rides. I'll be new to this type of riding and have started to research things a bit. I have a few questions I'd like to ask here:

1) What are some recommended brands/models (I like the Surly Steamroller)?
2) Can I use a quick release rear wheel? Most pix show bolts as opposed to q/r.
3) If I can't use q/r, how do you change a flat? (I'm guessing I'd have to bring wrenches in addition to my multi-tool).
4) I know I'd like a steel frame, but should I look only at ss and fixed gear frames, or is converting from an older, geared model an option-if so I'm guessing I'd need something like the Singleator to regulate chain tension and compensate for stretch......
5) If I went with a track frame, would it have mounts for road brakes? It seems that fixies use a front brake only as an emergancy brake-I'd like front/rear road brakes.
6) Does a s/s with horizontal rear dropouts require additional hardware, ie spacing or tensioning devices, or, like my old bmx, do you pull the wheel until appropriate chain tension is achieved and simply tighten the wheel?
7) Gear ratios: I know that will be important, any recommendations on front and reat ratios for a commuter setup?
and lastly,
8) What are some tips to save $ while setting up a decent ride? I know I won't be spending on derrailleurs, shifters, cassettes, etc, but what are some DC/Metro area resources for finding inexpensive frames and parts.

I know I've asked alot of questions, any advice would be greatly appreciated.