Yeah, I'd say try Torchlight. The quests are optional, and they're all things like "kill this dude," so you'd do them anyway, and you can let the quest giver know when you're back in town to sell loot or whatever. Heck, you could just send your pet back to town to sell loot if you want. It's out on XBLA and PC. There's even a demo on Steam, so you don't have to buy it to see if you like it.