WarmWaterDiver:TyTy
You might want to investigate the TUSA IQ-700. For the number of features, plus ability to 'grow' on if you should pursue Nitrox and more advanced training later, I don't see anything else on the market at < $400 that offers as much. I acquired one a few months ago and have been very happy with it - the only thing I changed was the wrist strap to the equivalent NiTek Duo cinch strap.
I have something to agree on with St. Somewhere - you should check Scubatoys. The TUSA IQ-700's 'list price' at Scubatoys is $389, $11 less than the 'list price' for the NiTek Duo at Scubatoys, and I'll bet if you call them, you could wind up with a lot of features for the buck. The TUSA also has a 2 year warranty versus 1 year warranty on the NiTek Duo.
http://www.scubatoys.com/store/Scuba_Nitrox_Computers.asp?PAGE=3
If that isn't what you're looking for, you can check their sale currently on Aeris models, since that's one brand you listed a preference for. They currently show the Atmos1 at $163.90, and Atmos2 at $289, with a $50 adder for the download cable for either model.
http://www.scubatoys.com/store/salesPage.asp
I started with an Oceanic Data Plus in 1999, but as my diving interests grew, the Oceanic Data Plus couldn't grow with them. My current setup is something I don't expect to outgrow any time soon (next 10 years, after that, who knows what my interests will be or what technology will change, but my personal interest in further training level of diving complexity is pretty well plateaued at ANDI TSD-3).
Hmmm, I hadent seen that Aeris Atmos 2. I was leaning towards the Oceanic Veo 250 but Ill have to take a good look at the Atmos 2 and compare them.
Wow, this board is SO helpful, thank you for all the opinions and answers, I really really really appreciate it!!!!