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An older Shimano 6/7/8 speed Hyperglide hub will be 126mm and won't have the long weak axle problem that I think @mdcc_tester is referring to. 7 speeds will definitely fit. There's a chance you might squeeze all 8 gears into a 126mm space, but I've got a feeling the bottom gear might be too close to the stay. Bankrupt Bike Parts keep a stash of those hubs.
7, but the axle is weak so you might want to consider an IGH.
Rim internal width at least 17mm for 33mm tyres, and 22-25 would be ideal.