Finally, something worth posting! haha.
My first IPA used citra to finish, and it was quite nice after about a 2 month conditioning. I was hoping to get 45-50 for them since I went through and put in good FDA food grade o-rings, took them apart and completely cleaned them. For the carboys, I was thinking like ~20 for glass and 15 for plastic. I only use plastic now since you won't break it, lighter weight, etc. It only took me one broken carboy to change my attitude on that, and still makes GREAT IPAs! Usually keep 'em around 7-8% abv and dry hop for 1-2 months in secondary, which is WELL worth it.
Probably wouldn't be worth the effort for the kegs, there's a place around here that sells clean good kegs for a little less than that.
I'm happy using glass carboys, but have yet to break one. I'm sure it was a disaster if it was full.