Looking for a dive computer

[jmohns]

Hello all,
      As usual I am asking the board for its opinion about my next purchase. I think I am ready to step up to a computer in the near term and know very little about them. This is starting to sound like my previous posts, sorry I will try to change it up some. I am really not sure of what I would like other than I would like the most bang for my buck. I currently am enrolled in OWA and would like a puter that will tell me deco info along with ascent rates. Nitrox is good as well and ease of operation. It also needs to be "Fireman Proof" in construction and will last a long time. User serviceable batt and computer interface would be nice as well. As usual, any and all assistance is welcome.
Thank you,
James