If you are getting into rebreather, then you also need to look at the inspiration rebreather, and the computer designed for it (Buddy Nexus).
I think all the information is at
http://www.apvalves.com
I suspect that different re-breathers need / operate with different computers, so it is probably worth catching the re-breather experts and talking to them before you buy a computer.
If I remember, the Nexus has two modes, constant FO2 and constant P02. This is something that no other computers that I am aware of do. It is also programable for mix changing during the dive, eg high %O2 for deco stops.
(Constant FO2 is air, nitrox or semi-closed rebreather, constant PO2 is closed-circuit rebreather)
It also will (unlike almost every other computer) let you change between modes in between dives, without waiting inordinate times.
If I can stop spending money on other things I will get one of these.
Just .02
Jon T