the wheel size looks fine.
another option is 205/55R16 which is a much more common size.
You'd be fine the iPikes. even the cheapest snow tire you can buy will be 100 times better than all seasons
May 2014 ROTM, June 2015 ROTM
for auto-x: '04 Liquid Grey ZX3
Build Thread: http://www.focusfanatics.com/forum/ford-focus-builds-general-showroom/317578-liquid-grey-widebody-cobra-rs.html
Sold: '02 Infrared SVT