My advice for rock n Punk would be to stick with humbuckers, & get hold of an Epiphone SG (G-400) or a Les Paul (Although the SG has a more attacking tone to it, which just works better for rock n especially Punk). But I'd say try before you buy, if you can. for £400 though, best bet is an Epi G-400.
The rig:
Gibson SG faded special -> Marshall MG 50/100 (working on a valve amp)
Backup: Vintage AV1
Newcastle United