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My opinion:
If you have made it this far without a computer, you can keep going. I was taught on a computer. It is now nothing more than a fancy backup to my depth gauge/bottom timer. I recommend nitrox, just watch your CNS clock. After that take advanced nitrox and use O2 to speed up off gassing at your safety stop. You can come off almost as clean of N2 afterward and that makes me feel better.
To Be Fair:
A computer can extend bottom times. If your buddies dive with computers, it is nice to be down longer with them. If you go this route, I like the Suunto Viper Air. It is nitrox compatible up to 99%.
Flaming pants?
Anyone have any gripes with the XR2?
OK, don't get the computer.
The latter.care to elaborate? Or are you just talking sh!t.