Ok, thanks for all the advice guys. Found a nail in my rear tyre, so took that as a sign from above and went to get the new wheels and tyres today.

Ended up getting the 18x7.5 Lenso GF7 black with chrome lip, and a set of kumho KU23 tyres.

One thing I forgot to ask the tyre place is what is the correct pressure for these tyres (225/40/18R).