Additional units and speakers for a complete rack rig

[audioshockandawe]

Hello. I'm completely new to the whole world of rack units, the Triton Rack being my first, and I was thinking about getting a keyboard or bass amp but now I want to mount my Triton Rack with other units and use a power amp and speakers. Does anyone have any advice on what other types of rack units, kinds of power amps, and kinds of spakers make for a great rig? All advice is greatly appreciated. P.S. I use an M-Audio Keystation 88es for a controller. Thanks!!!

Matt