We've already agreed as a group that you retain your memories/etc when I raise you as a greater undead, so if he retains memory and personality, he'll certainly continue to be playable, by my DM's standards.
Since I am the "Leader" of our little adventuring party, and I am a necromancer of no mean skill, everyone already knows they are all gonna come back eventually. The higher level I get, the better the undead they will come back as, also. Heh. I have a lot of fun with this character, aside from that momentary heart attack I had at Rystil's initial pronouncement. =)