I forgot about this thread on ClubLexus
Lexus ISx50 Aftermarket Wheel Thread: http://www.clublexus.com/forums/is-second-generation/201509-aftermarket-wheel-owners-post-your-setup.html
i was bored... here you go:
vendors marketplace: http://www.clublexus.com/forums/club-lexus-vendor-marketplace-118/
wheels/tires classifieds: http://www.clublexus.com/forums/wheels-and-tires-classifieds-41/
hit up www.clublexus.com
they have a vendor specials section and a lot of wheel vendors are on there. you'll find a good deal on some sick wheels. hell, you can even buy some used wheels and save yourself some coin.
A little info about wheels... the offset is not what determines whether or not the spokes will hit the caliper. That is determined by the disk pad (high disk pad wheels will have less lip whereas low disk pad wheels will have lots of lip but very little clearance behind the spokes). The design of the spokes also plays a role.