stick with the mr7's in 18"
they will fill out your wheel wells perfectly (especially with a bodykit) you will look very tight (yesh toight like a toiger)
they look so even and clean ... you wont look like an suv ... with the right kit an 18's , you wont need a very large drop to sit your chassis so there is an even gap all the way around the wheel in the wheel well...
plus you wont be too low to the ground (scraping) ... you will be closer to stock ride height / feel ... and have a very clean look to the car...
IMO