Have you checked out my thread on my DIY open source arduino lithium BMS (dang thats a mouth full haha)? I thought I recommended it earlier, but I couldn't find a link so here it is:
http://ecomodder.com/forum/showthrea...tem-20445.html
It would work great for your setup, its very inexpensive, and I use some other premade circuits so there is less custom work and less programming.
I used the BMS on my PHEV kit that I had on my last Prius. The charging protection worked great. Unfortunately, I never got around to working all the quirks out of the discharge protection, but its really a lot less necessary if you just get an amp hour counter.