well seperate it up, you have £100 for everything, so that makes £50 for a mask since you want imo either a proflex/flex 7 or 8, a profiler, an invision/I3 or a axis. but thats just me
after that what do you want, you could always either spend it on paintballing, or you could try and get your hands on an e1 frame in the forums, could be your lucky day if ya get one for £50 (i dont know how much they go for), but £50 aint a huge amount of money, i would save for a better air system and hopper personally, but again, thats just me
-Mat