my very best purchase would have to be the huge deal I got when I bought the dismembered 800g sw set up that the dudes ex wife destroyed out of spite. she smashed the tank to get it out of her house, threw the coral and live rock out in the back yard in the middle of winter. what a (&*&%&^$%$&*^*(
though I did get lights, uv, etc.... a good score for 500bucks, almost enough to run a single filter system for multiple tanks the dude believed in serious overkill had this set up to do like a 3000g rating