Quote:
Originally Posted by graham.hobart
how do I know I get the right sized frame?
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There are several approaches....
a tractor! a penguin! a hot water cylinder! 
....sorry just had a seizure. Anyway there are several approaches but as a general rule you should be able to straddle the top tube with both feet on the ground with some room to spare. I find that the most important one, for obvious reasons.
Also during your test ride, make sure your feet don't hit the front wheel when turning.
Disc brakes: stay clear of anything less than 160mm disc diameter.
If this is going to be a workhorse, consider one that has enough clearance to fit 28mm tyres and posssibly some narrow fenders between the tyres and frame. Not possible on many roadies.