Just remember, as far as tires go you usually get what you pay for.. You buy a cheap tire, expect to replace it...
So, IMHO spend a few more bucks and match the front tires with BFG. The guy I just bought my wheels/tires from bought sumi's and he hates them with a passion (he got 17/9, 17/10.5 bullitts.) But as far as the tires go, he got what he paid for.
Im sure others have had different results with Sumi's, and honestly they don't look all that bad, but I can only go by what he has told me as far as wet weather traction etc..
Discount Tire Direct has
these Falken w Rated for 108.00 **Free shipping
Tire Rack has the
Kumho 712's for 104.00 zr rated. I have these tires and I love them. Tire rack is gonna charge you to ship them too..
So in all reality ordering from tire-rack you'll still have to pay an extra 40-50bucks..