Hi,
You wont have any problems installing a NEO2.2 chip in that version ps2. But for a little extra cash u could have a Messiah fitted and to be honest the swapping of the boot cd for a backup does get on your nerves. I reckon ill be upgrading to a Messiah soon. (when i get my arse in gear)
Good Luck
Dal
p.s Hey Charlie, hope your well m8. MSN me sometime its been a while.