Man, you guys are making a mountain out of mole-hill... I've seen great players grab a pawn-shop Sears guitar and make it sound amazing... this whole idea that your guitar is going to need a "complete setup" because you went from .009s to .010s is just dis-information in my opinion. I honestly think you're making it sound like this HUGE issue when in reality, its no big deal, especially on a fixed bridge system.

With a floating bridge and the idea of "going into a panic"... come on Maggior... its a matter of turning a couple of screws in the back... not a "full setup". When you said you had "experience though not with a floating bridge", I mean, really? Like what? Experience winding the strings onto the guitar? I just don't see what "experience" someone needs to gain before they can attempt to switch .010s for .009s on a Strat and turn the trem screws on the back of the guitar to compensate for the new gauge.

Guys, its a guitar... its not rocket science. Experimenting with between the three adjusted sizes as suggested by the OP is not going to get him into trouble. You're going way beyond the original question... keep in mind in my original response I suggested trying .009s and then .010s... I think that's perfectly reasonable advice.