I currently have a WoodMaxx MX-9900 PTO powered chipper. It is GREAT! Hydraulic feed is definitely the way to go! Before that I had a BearCat PTO powered chipper/shredder. It was also a beast but was manually fed. Definitely a lot more work to operate than the WoodMaxx.
Sometimes I wish I had a gas powered model, but if I went that route, I would definitely go bigger than the WoodMaxx DC-1260 that you're looking at. Here's a link to BearCat's gas powered chipper page:
www.bearcatproducts.com
Based on my experience between a manual feed (pushing into a chute) and a hydraulic feed, I'd definitely want the hydraulic feed. So much easier and less strenuous to operate. But, to go that route, you're looking at a LOT more money than you would with a PTO powered unit.
The reason that I'd want the gas powered unit would be to use the tractor the load bigger, longer logs into the feed chute than I can comfortably handle by hand (since I'm an old, out of shape, gray haired guy). My WoodMaxx will handle up to 9", but I generally don't feed more than a 6" (most stuff is smaller than that) log into it. It would be nice to use the forks to help load longer, heavier stuff without having to cut it into smaller pieces.
I've never wanted a separate unit for hauling away the chips. Usually I'm chipping in the same part of the yard and just add to the chip/mulch pile. And, even when I'm chipping in the woods, I just let it pile up and then move the chips when I'm done. You're generally not building a chip pile so fast that someone has to keep up on it during the process.