DeadCactus,
I've had the same experience as Stu S. Pelagic Pressure Systems (Oceanic, Aeris, Genesis, Sherwood) and Cochran have the most liberal NDL algorithms. Seiko (Dive Rite, Tusa, Cressi, Zeagle), Uwatec, and Suunto are more conservative and I have found them to be reasonably similar.
I've had a DR Nitek Duo for a bit over a year and just under a hundred dives. I like it very much for reasons that have been pointed out, 2 gases, download (I also send my dives directly to DAN for PDE). I like the average depth displayed in the log for SAC calculation. I initially used it with the wrist strap it came with but switched to the bungee mount that is readily available for these computers.
It's interesting that the Seiko computers vary considerably in cost. Scuba.com happens to have all 4 available in the US. The Cressi AII and its download kit are the least expensive of the bunch by a fair margin.
Best of luck in your shopping. Most importantly, make sure you meet all your current and short to intermediate future needs.
Good diving, Craig