As far as cross skills go, you'll want to get lancer to 34 for Blood for blood (20% damage buff for 25% damage taken, very important in dungeons/raids) and invigorate 300tp restore for long fights/AoE. Marauder has a nice defensive skills, a DoT called fracture and a 200 potency execute at level 26.

Love MNKs, much more active and rewarding than DRG. The rotation can get very complicated and Greased Lightning drops a little quickly (i.e. almost any time you have to avoid AoE), but i relish mastering difficult classes.