Check out the Laguna Research UDC and PO2 monitor unit. I am getting it because on the unit it has 3 k-1 cells, an injection port on the P-connector, its extremely light and compact and has an excellent hardware part. The UDC controller has a field removable (swappable) IC, anodized aluminum casingand a separate fischer connection to dive computer. The stand alone unit will display time, PO2 and fO2.
The coolest thing is the UDC and PO2 monitor is completely modular, you can add a HUD(ILM) and a solenoid controller (CCM) for eCCR/mCCR modes. I am going to get this for my Azimuth in the next two months and i'll make an post when I get it setup.
http://www.lagunaresearch.com/pdf/UW..._Manual_v3.pdf