For me it was;
Phoenix Overlord: $80
Saber Reinforcement: $30
After reading
this I did not feel too bad about getting it since the premium time was "worth it", though I feel bad about it in the mean time since I have no idea what "real advantage" the Phoenix mechs really provide. Yes, some special loyalty bonus were advertised, but I have yet to see any results....yes, yes, Soon™, I know...
Considering some of the epic crud you can buy with 40$ at your average game shop, or games that give you a few hours of good game play before getting boring, MWO has relatively equated to more than the "play time" of 3 store bought games.
None the less I decided to hold off on the Clan packs just because of the experiences I made with the Phoenix mechs, e.g. the C-bill versions were all better, the Champion bonus (+10% xp) is only useful until you master that chassis, and I have yet to see any benefit of the mythical loyalty bonus.
There has to be some major "WOW" going on for me to consider spending any more than I have on MWO so far. I kinda feel bad for those that spent more than 200$ so far.