Hmm, I'm like N7-180 or so, I've promoted Engineer (Sal), Adept (Drell), Sentinel (Truian) and Vanguard (Asari) at least once.
For weapons, I've maxed the at least two of the starter weapons, two of either the Mantis, Avenger, or Shuriken, I forget which and the remaining one is at IX, even though I mostly use the Predator and it's only at VII. If your goal is to max those then all you need to do is buy recruit packs. I also have a LOT of shotguns, even though I never use them.
As for classes, I have all of the old ones unlocked except for the Drell Vanguard, Turian and Krogan Soldiers, and Krogan Sentinel. I have all the options unlocked for the Salarian Engineer, the Drell Adept, and I think the Asari Vanguard, or close to it, and maybe some of the humans too, although I rarely use them so I'm not sure.
What I'd really like is some more pistol mods, as I only have damage, scope, and ammo, and more Raptor rifles would be nice too. also exotic guns that shoot explosives would be fun, if not practical.