why should I NOT buy these rims?

[BEEF]

I have been looking into getting some very plane jane black rims for my car. I like a black car with black rims.

I know nothing about rims and backspacing and what not. any advice would be greatly appreciated. I do not plan to lower the vehicle any and I plan to reuse the tires on the factory rims as they look to be 90%+ on tread.

I can get these rims for $85 each and get free shipping. I can also get the tires changed over for $15 each. total is going to be around $400

http://www.jcwhitney.com/air-wheel/p...id=d17496y2008

also, I am going to have some factory steelies and hubcaps extra if I do this, what do you think they are worth?

I know, a lot of questions. thanks for any replies.