at the moment iv got a crappy ibanez, line6 spider III 30 amp, a digitech death metal pedal and Boss HM-2 pedal.
Can anyone offer any advice on what settings to use to get the sound similar to what the melodic death metal bands of the 90's had.
Or recomend any product within £100 that would help.

I dont think you should spend any more money on your current rig, what i would do is just use one pedal and perhaps increase the mids.