I don't know if you have already made your mind but here's my opinion.
This kind of a situations are always difficult. like when i was buying a tv, i first checked out the nicest tv in the store, and after that all the others didn't give me any satisfaction :)
If i'd have the money, i'd buy that XTC, because i know i would just spend the rest of the money on nightclubs and so on haha :D
But anyways, i ended up buying that expensive tv and i dont regret it one bit.
You'll have to think if there's something that would give you more satisfaction for the money than that amp.
I remember when i spend all my the money i got from my summer job on a guitar and amp. but i cant really think anything else that would have given me the same satisfaction.