I've finished spending money on this thing now, apart from the 70mm medusa which is yet to be released, so I think I've spent somewhere in the $3200 range, havent calculated it precisely, nor do I want to...
I currently use 2 pairs of 6s A123 packs for a 6s2p each run, works very well and gives pretty good runtime. I also recently purchased some nice new lipos, which will unveiled shortly after their maiden run on video