Back to the original question - which computer. I have been diving a Nitek He for several years. Works well for multi-gas diving, including deco with several gases. Also handles helium mixtures. The problems are not with the computer, the deco algorithm, etc. Rather I find the display hard to read, particularly at depth, in dark / low vis conditions. Now I have added a Liquivision X1. Highly (and I would underline that, put it in bold face italics, and add exclamation points) recommend the X1, based on ease of use, and the best / brightest display i have encountered (and time that displays seconds). If you are already spending the money to move into trimix, spending the $1700 or so on a X1 is really not that big a deal.I plan to continue with tek diving and complete my trimix certifcation in the future. I want to purchase a computer i won't have to replace for many years. Any suggestions?
Personally, I find the debates about the relative 'conservatism' of different computers to be interesting. Generally, one sentiment seems to be that 'some computers are too conservative, so I will look for a less conservative one.' Is this somewhat akin to repeatedly asking a question until you get the answer you want to begin with. I cannot comment on the relative 'conservatism' of different units, rather I continue to cut tables, dive my plan, and use my computer as an important secondary source of information. I figure that whatever software I use for tables (DPLAN in my case) will provide a reasonably appropriate dive plan.