I am looking into a dive computer, myself. What I can tell you is if you haven't for some reason, absolutely ruled out Nitrox, then you might want to look for a Nitrox capable computer. Reasons: 1. You will only pay a little bit more, and it will do air just fine. 2. If you decide you want to do Nitrox, you don't have to go out and buy a new computer. 3. Even if you have ruled out Nitrox now, you may learn more about it and decide to try it, again no search for a new computer.
I don't know what brands of computers are available and readily serviced there, but I have been looking at Scubapro and Aeries, because most of the people I dive with really seem to like their Scubapro and Aeries computers. They also say they think the servicing of these brands is very good.
I know this isn't much help, but I am sure you will get more help here, since everyone on the forums seems to really want to help the newbies. I know they really like to encourage people who are new to the sport.
emeyer36