Great combo - the Paladin/Mage was my favorite for a 2-box. I was spec'd AoE-prot on the paladin and arcane/fire on the mage though - 12-20 enemies drop pretty fast. Read up on Paladin AoE grinding, then apply blizzard/flamestrike/arcane explosion to help grind them down.

I use Bongos2 and I love it. Since I'm broadcasting keys, I use SHIFT+# for paladin commands, F1-F12 for combo commands that both the paladin & shamen have macros for, and normal # keys for my shaman spells. My ALT+# and CTRL+# commands are usually a mix of paladin & shaman macros.