If I'm primarily interested in unlocking new weapons and classes, and assuming I've got 60k or so in credits, am I better off buying 12 Recruit packs for 5k each or 3 Veteran Packs or 1 Spectre pack? I'm sure once I have a lot of races and weapons unlocked for multiplayer, saving for the Spectre packs will be the better idea (unless I need medi-gel/rockets/etc).
However I'm just starting out and I really want (amongst other things) to be able to play a Krogan!