Yeah I keep a close eye on how much I spend because I too am in university and have expenses. I have spent roughly $1k. However, I am making sure that I don't go over that amount.
Yeah... big collections are awesome, but IMHO you only need one aeg and a pistol at the most. Maybe have one extra aeg as a loaner.
I would like to have a XM177E2 and a Romanian AIMS as my collection. I have found that building your own gun can be a LOT cheaper. Plus, you appreciate your gun more after going through the pain of building it yourself