Decided to go for it's bigger brother, the G510 16GB + 1GB sounded far better than the Y300. Only costing me an extra £3 on the contract too.
Gonna take some getting used to the BIG slab feel after walking around with the N900 day in - day out. Not used Android for some time so getting used to that again.
Don't think I'll dump the N900 anytime soon, doing a lot of comparisons at the mo and I can honestly say at this stage (although it's early) I'll definitely miss the N900 if I was to sell it on.
Don't think I'll use the G510 as much as the N900 TBH, use it a lot at work.

The lack of support for media formats has already reared it's ugly head, got my old N900 8GB memory card in it and can't play any of the videos on there, so that's another reason for hanging on to "The Beast".