Help me build a bike! - Health, Fitness, and Sports

So I got a relatively nice Motobecane frame, but the cassette stripped off the threads on the rear wheel, so the rear wheel is unusable now. So I need a new rear wheel and I'm wondering what to do. It's an older bike, so it's running 27 inch tires. I have a set of VERY nice older 27 inch tires I found in the trash (new with tags) that I could use. So basically I'm wondering if I should stay 27 inch for the back wheel, or put a 700c back wheel on? If I put a 700c back wheel on, it'll probably not have a 700c front wheel on, at least for a little bit of time. So there's that to keep in mind. Also, for 700c, how narrow should I go for street riding?

Also, I plan to just make it a single speed bike. Does anyone have any good ideas on gearing to use? My town is fairly hilly, not like, say, Vermont, but not flat either. I have a 3 speed that works with a Sturmey Archer hub, but the gearing on that is ridiculously tall for where I live. Plus it seems like a single speed bike would just be less complicated crap to deal with. No, not gonna go fixie, at least on this bike, I got other frames if I wanna do that. I'm a 195lb rider, not a super fast rider by any means, so it's hard to say, but I'm wondering what sprocket teeth numbers you'd recommend. I tend to not like spinning high RPMs, too.

Let's see, what else... uh, anything else I'm missing? I'm rusty at this.
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