Get the Brigestone S03,s probably the best tire out there for the $$,Toyo,s T1s are great too because there really light but are hard to get and will be $250 for a 18.
Go with the 18 inch combo,it looks the tits and is the only way to go on a big car ,I did mine on my 7 and I,m real happy,also its functional for maximum contact patch when I go single, haha . C.