Apex FL-5 are very light, 18x10 weighs 20.5#, and 18x10.5 weighs 21#.
https://www.apexraceparts.com/our-wh...ution-fl5.html
The 18x10.5 may be the best choice, so that you get more performance out of 275-305 width tires.
I have a set of the 18x10 on my LS 1LE (FE3 suspension), and I really like them. With a 5mm spacer, they clear my strut. Note, this is a BMW wheel, so I use plastic rings to make them hubcentric. (I am about to fix this with some custom 12 mm bolt-on spacers that will have BMW hub spacing.)