I don't know how many manufacturers (if any) produce a mirrored design of any of their right-handed products. However, most manufacturers produce handed-neutral designs, so those would (at this point in time) probably be your best bet.
I'd also highly recommend you go with a "laser" class optical mouse, instead of a regular "optical" optical mouse, both because of higher tracking precision, as well as far greater surface compatibility.
I briefly owned an Apple Mighty Mouse, and couldn't believe how poor it's tracking and surface compatibility was. I bought and returned it the same day.
I also see little benefit in going with a wireless mouse. You have another battery to replace, if it's not bluetooth then you have to attach a dongle of some kind, and frankly with bluetooth the response just simply sucks. I bought a wireless Microsoft Laser Mouse for my PowerBook (the theory being when I'm out and about and don't want to take a full-sized mouse with me) but honestly I never use it. It's less inconvenient for me to use the touchpad on my PowerBook than to use mouse for those relatively short periods of time when I might use it (since the rest would be in circumstances where a mouse simply wouldn't be appropriate anyhow).