Lots of ideas, but there's a lot of variables as well. Do you want something that feels similar to your Mini? What's your budget? Do you have any features that are must-haves? Anything you particularly dislike on some guns? Do you have any particular company preferences, or just open to anything? Do you want a speedball gun, woodsball gun, mil-sim gun, pistol, pump, mechanical, electronic? Just looking for some baseline to start from.
Before anyone lashes out, there's some folks that would say some pumps/mechs/pistols are an upgrade from a Mini.