I BELIEVE neither of the R1 DVDs contain the original soundtrack, from what I've seen posted here, but hopefully someone can give you a more concrete answer than that. I'd like to buy the collector's edition, but not if it's been "butchered" 'Tour Of Duty' style! :(
I bought the version depicted ins this page and the soundtrack was the one i expected with the punk music from that time. Now, if you are looking for Return of the living dead 2 that's another story because they changed everything, including the original soundtrack so you better get a an original vhs and in perfect condition and convert it to dvd if possible.
Blu-Rays are basically all-region. The only problem with British editions is that their default transfer rate is 25-frames-per-second, which makes all their film-based transfers sound sped-up. I don't think this applies to all their blu-rays, but I'm not absolutely sure.