18x9.5 verse 18x10.5

Ok i can get 4 chrome Y2k C5 wheels in 18x9.5 on ebay for $899. Is it worth an extra $400 to get 18x10.5's for all 4 corners ($1299)?

If i got the 18x9.5 i was going to go with 275/35 on all corners and if i got the 18x10.5 i was going to run 285/35 on all corners. Will they look that much better and perform that much better to justify the extra $400 on wheels that are 1 inch wider and tires that are a little wider? Will both these fit fine without rubbing on a camaro with a pro-kit and revalves.

Thanks

I don't think you'll need the bigger ones, especially if you're only the running 285s. Hmm....actually you could probably fit those on the 9.5" rims.