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Super Wide angles are great fun. However the 17-85 is going to be a hard focal range to replace.
The 17-40 is really designed to be a Wide angle on a 1.3 or Full frame sensor, so on a crop sensor it wont be very wide and wont give you much range.
Personally i would get the 10-20 and then worry about the rest of the focal range later (i just love super wide angles). I'm not a huge fan of the 50mm 1.8, good for the price, but not great compared to most lenses.
the siggy 10-20 is a great little lens. I would still have one in a shot if i wasnt shooting 1.3crop. Ok its not L glass but I had alot of published work with it and never had an issue with it. The 17-40 is going to be about 27-64 on 1.6crop which isnt wide at all.
The 50 1.8 is the best bang for buck lens around. Yes, it's cheap, plastic, the bokeh is a little ugly, and the AF is noisy and crap is low light, but it is sharp and for the money you really can't go wrong.