I haven't actually been into cubing for very long, and I don't have much money so my collection is kind of small
Rubik's Revenge (ITC)
Follow up to the Rubik's cube, as shown by its name.
Produced in 1982 and 1983 by Ideal Toy Corporation in Korea, Macau and Hong Kong.
Rubik's Studio 5x5x5
The new retooled version of Rubik's Revenge produced in Hungary by Rubik's Studio
CUBE (SHAPE CHANGING)
A midturn 3x3x3 still in hexahedral shape but with such an awkwardly oriented axis system that every piece is uniquely shape and therefore sticker can be unicolored.
Starting with all six balls inside the center sphere and the locking rings open, the challenge is to move the balls into their matching coloured domes on the outside.