Hi everybody, this is my small collection:
2x2 (it's a knockoff so I won't mention the brand)
2x2 Rubik's Ice Cube
3x3 Rubik's brand
3x3 Rubik's Game (weird 3x3 with holes to put in plastic things)
3x3 DIY (not sure of the brand, I just bought it at a competition, it's not so good)
3x3 Dayan Zhanchi is on it's way at the moment from Cube4you.
4x4 Meffert's
5x5 VCube and another 5x5 VCube which I'm currently modding for a friend
5x5 Knockoff, terrible quality
6x6 VCube
7x7 VCube
Bump Cube
Rubik's 360
Two Square-1's
Alexander's Star
Small 3x3 Cylinder Cube
Mf8 Megaminx
Pyraminx

I will probably end up getting a better 4x4, like an Eastsheen, but after that, I think I will just start getting more fun puzzles. I was considering getting a Gigaminx, but with its cost I could get 2-3 more puzzles, so I will wait for that for later. I was thinking some Cuboids, like 3x3x4 or tower cube, but there are just so many cubes out there I don't know which to get.

Thanks for your comments in advance!

Genuine Skewb plus a 4x4x5 or 4x4x6. Great quality puzzles which every collection should have.