I would suggest this;
18x9.5 (or 19x9.5") +20 (to +25mm), just remember that you can always use spacers if you need more space or want more poke. If you use fender flares the +20mm offset should sit nicely flush with the flares themselves.
I would suggest no wider than 235 width tires. The sizes would be as follows 235/40R18 or 235/35R19. This would allow for good quality high performance tires without going all the way into super high performance or competition grade tires like Galantman03 will be using ;) .
You can also go to www.tyrestretch.com to view different types of tires on your desired wheel widths and 18s versus 19s
Keep in mind, if you choose to go that wide and use 235 tires or wider you will need *may* need tomodify the rear fenders heavily. If you have any more questions just ask. If I think of anything else that could help you out I'll post it.
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