They're awesome wheels on either. Personally I feel like 255s are too small for a 100, even my Tacoma felt like I wanted bigger tires... at least visually. Performance wise, they're an awesome size. Good compromise between size, weight and sidewall height.
$640 for a set of 4, plus shipping brought the total to around $700.
Where did you find them for 640? Their website quoted me 820 shipped and 720 before shipping