We have gone with a Medium cube as we aren't taking any furniture - just personal effects, clothing, etc... This is what I managed to fit in:
42" TV
26" TV
26" PC Monitor
Tower PC Base Unit
4 x DJ Decks (CD & Vinyl) + Mixer
Hi Fi
Small powered speakers
2 Drawer filing cabinet & paperwork
Clothes - all packed in Vacuum bags to save space
Books, DVDs, CD's
Kitchen: Crockery, Pans, Mugs, Glasses
Quite a lot more as well!
The photo shows the dry-run/Tetris testing area I have marked out to get the most in possible before the Cube arrives!! There is still space on top, which I will be filling before the big day!