You wont find too many 10mm spacers. Usually its 5,6,7,14,15,20. In your case a 7mm would do fine.
Not sure if you like the styling but the OZ Alleggerita HLT are nice wheels. 17lbs front, 20lbs rears in the right offsets, no spacers required.
Tire Rack - Your performance experts for tires and wheels carries them, not sure if others do. My advice is try very hard to find wheels that don't need spacers. I have, and do use spacers but whenever I get the chance not to use them I always pick that option unless its significantly more money or a style not available otherwise.