Thanks, JDW. I think I'll go for the Peithman edition. I don't think it is truly 'complete' (61 tales?) but I think it'll fill the gaps in my Poe knowledge nicely. It seems that it makes liberal use of the annotations from the editions you mentioned, according to this review [
www.eapoe.org] which probably means it plagiarises massively, but as I'll be buying second hand that doesn't really concern me. My only reservation is it sounds like there's a lot of typos! I'm hoping that they're mainly found in the notes rather than the texts, but I'm probably just fooling myself... Anyway, I'll sleep on it for a bit as it doesn't seem like a particularly rare or sort out edition.
I'm not really sure how they can justify the prices for the Mabbott editions tbh. Sure, I'm all for academic research being rewarded, but I doubt anyone but the publishers will be making a living from this pricing policy. Better to get the good research out of the uni libraries and into the hands of the readers, I say.