First: (26", borrowed off Dad) Raleigh Maverick
Had a 22" MBK and 24" Diamondback before that.
Then a Saracen Rufftrax (weighed 40+lb, horrible geometry, but lasted a good couple of years before the cassette was beyond the ninja throwing star phase)
Then a carrera fury (well built, good spec, crap geometry)
Then a DMR switchback (arguably a proper mountainbike)
Then a 456, my first sideways step in MTB, untill now everythings been a huge leap forewards, this was just a change.
Had a few flings allong the way, full sus, carbon, but they've all been sold in under a couple of months.