50/34 vs 52/36 crankset for 11-32 cassette (shimano 105 5800FC)
50/34 with and 11/32 on the rear is going to be very spinny. 
For me - the range is too wide and the gaps between the gears too big. But - this depends on the kind of riding you will be doing. If you are riding the very steepest of mountains - than the 34/32 combination might be what you are looking for.
Purely for fast road work - that's too wide a combination (for my personal taste).
The other thing you will have to consider is the rear mech. For such a wide range you will need to go with a mid or long cage rear mech. I don't think it will work with a standard short cage.
However, I have used 50/34 with 11/28 on a short cage - and that has been OK.

Try the Sheldon Brown gear calculator to work out the combination which will work for you.

http://www.sheldonbrown.com/gear-calc.html