^ If you plan for a family look into a G8. Constantly leaning over the front seat to buckle and unbuckle Jr. in the back will get tiresome before long.
I wouldn't worry too much about more $$$. The 04s use a LS1 v8, parts are easily available from several cars, the 05-06 uses a LS2 vette motor, might cost a little more for some parts, but most still aren't too bad considering.
Fuel is going to be about the same, if you keep your foot out of it they average the same #s, sometimes better. If you play all day tho, you will have pay for it.