I haven't used gDiapers (I've used a variety of different ones, but not those). However, for the poopy part of the problem, I would suggest looking at the flushable diaper liners. Bummis and ImseVimse make them, and I think one of the other companies does, too. You just toss the whole mess (flushable liner & poop) and flush it down the toilet. It won't take care of every little bit, but it sure makes it a lot less gross to deal with. My DH, not a man with a strong stomach, can handle cloth diapering because of those. He said that if we had tried cd'ing w/o the flushable liners, he'd have quit after the first poop. Now, he's still grossed out by them, but he can deal with it. :)
In terms of leaking, can you use microfiber towels in the diapers? You can buy a pack of those in the cleaning or auto sections of a store like Meijers. They are thin, and soak up a ton of liquid. However, you need to be sure that they don't touch his skin directly because they will dry his skin out.
If you have a Whole Foods or similar market, or a "natural parenting store," (here in Columbus, it's called "Sprout Soup"), you can probably find cloth diapers for sale, and you could buy one each of a brand or two to try out, or talk to the salesperson and ask them what they recommend.
You can also try www.myuseddiapers.com or www.diaperswappers.com (I think I have those sites listed correctly, but you might have to google them). They offer people the chance to see used cloth diapers and it's a great to try some kinds out without having to pay "new" prices.
I use mostly Chinese prefolds, sometimes with an extra layer of absorbency (I sewed some flannel over some microfiber towels and use those), and I use mostly ProRap covers, and haven't had any leaking. Our 22-month-old holds his pee all night and lets it go usually right after he wakes up and the diaper is pretty darn wet but no leaks, as long as I make sure none of the prefold is sticking out.
I do know some people end up doing disposables for night time, and cloth during the day. I figure whatever cd'ing you're doing, it's good for the pocket book and the environment....
You might also want to post your questions at one of the online cloth diaper forums.