Check out AZHitman's profile, and some of his posts about his tires. He's got Falkens in a 255 if i remember, but i don't recall the wheel width he uses. He's posted extensive info about his setup. A search in either this section or the Infinit General section should give you his posts to read.
Good stuff. I've always like Falkens, as they really are a good deal for the dollar. Customers are quite happy with them. They seem to wear decent, ride good, and have very few manufacture defects. It's a rare thing to have to replace a Falken tire under warranty for defect.
They also have the proper load capacity for the Q... so I'd say you're all out of excuses!

Go get 'em and tell us what you think!