I'm looking for a good bluetooth mouse to go with my MBP. i ordered a mighty mouse a while back (the wired ones) and the trackball blows, even if i give it a good cleaning. so i'm looking for a non-mighty mouse bluetooth mouse that is compatible with the MBP. easy to use, and some programmable buttons would be nice. i'd be willing to shoot for the 50ish range at this point. many thanks.