With 31"-32" tires, you could definitely run the 15x7's and be fine, and the 15x8's will be, too. I like the 31"-32" with no lift. I have 33x12.5 tires on 15x7's on a Jeep - not preferred but it came that way from PO.
As discussed, finding good 15x8's is harder and pricier than the 15x7's. We have places down in Texas that will re-chrome just about anything. However, re-chroming is uneconomical as it's $250-$300 per wheel (my last price check) plus cost of wheels. At some point, it may become worth it on 15x8 due to their rarity. You can find a great set of 15x7's now in the $800-$1,000 range. Cheaper if you can wait and scour the nearby craigslist. Even cheaper if find a set that just needs to have the clearcoat stripped and you strip and clean them.