i've got £800, which is roughly £1200

first off, i need some sort of USB interface, mics for vocals and for recording guitars, if i can get one to do both ill be very happy.

This is the part i need help with, for a while i was set on getting a 75 watt Peavey Vypyr, so well say £300 for the amp and £500 for the other stuff. After thinking about it a lot i think i'd be better with some sort of low wattage tube amp. I play a pretty big range of stuff, mostly high gain though. I don't really have any idea what i want, so i'll be very grateful for any help