I would recommend that you go with something lower end right now. You can get a good reliable computer that will meet all of your diving needs you stated for under $200-300.
I started with a Mares puck, Air, Nitrox up to 50%, and guage mode. $175 new. As mentioned by Buddha, a high price cable was needed to transfer my dives. $80
A couple months ago I bought an Aladin 2G here on SB. $150, needed a new battery, $10. It supports gas switching Nitrox to 100% and guage mode. This has infared and came with a USB infared receiver for your computer.
I have not come close to needing any more that either of these computers are capable of.
Save your money on something like this and use the difference to go dive.
Make sure whatever you choose has gauge mode. If you actually do want to get into tech or just upgrade and go for something like a petral, you will have a bottom timer or a backup computer... and a lot more diving under your belt.