The Motegi's are of good quality. I'm neutral about those rims. I wouldn't pay too much for them though.
Gunmetal in my opinion are good on black cars. I was gonna get my rims in gunmetal but I figured that I'd rather have a higher resale value and go back to stock rims before I sell the car and keep my rims for the next car.
A less than 2" drop would be nice. As for tire sizes, you can look above because they're right.