DM-5 with macdev 68-4500psi tank, and a Halo with the Boost duel power supply.
Battery is light weight, faster than stock batteries and charges in less than 2 hrs.
I have been using a Halo with the Boost duel battery set up since the Chicago PSP. The Boost loader uses the rechargeable battery with an external charging connection, and it also has a Boost hot-pack (disposable batt) as a back-up in case the rechargeable battery dies during a game, great idea. The rechargeable battery is much lighter than the stock six AA batteries, in fact it so light it doesn't even feel like there's batteries in it. Even with the duel battery set-up it's still lighter than the stock batteries.The battery charges in less than 2hrs and lasts for about 8-9 cases of paint. Because it puts out more juice than normal batteries it also spins the loader much faster. I have had no problems with burning up motors due to the increased voltage. I figured at the cost of $80 it will only take about 6-8 weeks of practice to pay for it's self.
I highly recommend the Boost rechargeable battery, it has worked flawlessly for me, it's cheaper than stock batteries in the long run, and it's so much lighter than the stock batteries.