I have a pair of Farralon Mk-6 DPVs. They weigh in excess of 70 lbs apiece, have almost endless power on time, take forever to recharge and if you need to swim one back to the boat you'd best pray that your buddy is close by with the other. The manufacturer is loing gone (though I know him and still have a personal relationship). They can be found, every now and again, for reasonable prices on eBay and such. Great DPV, probobly not the one for you though. You should consider: the ARMJET