Obviously there's only so much I can do online and eventually I have to play them but some do now seem more likely than others.
PRS - If the Tremonti is as bright or brighter than a Custom 24 I see absolutely no point in getting it as I might as well just get a second Custom 24 and change the tone with different pickups. That being the case, if I am to get a PRS that isn't a Custom 24 it would have to have the fat neck and the best option there seems to be the Bernie Marsden so I'll give that a try.
LTD - Everything I've heard suggests the EC-401 is a really good guitar and I know the neck is ideal for me. Upper fret access doesn't seem to be much better than any other Les Paul style guitar so it really depends on whether it has that deep and rich Les paul tone or not. If it doesn't, I won't be interested as again, I'd be better with a Custom 24 or one of the all mahogany LTD double cuts.
Epiphone - Due to my reservations about the quality of the Epiphones in comparison to PRS or LTD I'd say the Prophecy is out of the running as I can't see it giving me anything I can't get from PRS or LTD. The Matt Heafy model is a different story as the upper fret access on that is astonishing so I think I have to look at that.
Ibanez - A late consideration this but one that certainly seems to have some merits. Two models seem possible; the ART and ARZ. Both will have reasonably slim necks and both have fairly cheap models where the only difference with the more expensive ones are cheap Ibanez pickups but as I'd be changing the pickups anyway, that's not really an issue for me. The ART has the disadvantage of what looks like a conventional neck joint but other than that it seems fine, though again, it would depend on how close its core tone is to a Les Paul. The ARZ has much better upper fret access so the only thing that obviously puts me off this is the lack of fret markers (the main reason I bought the Jackson instead of the Torero) and of course, it would still depend on how close it is to a Les Paul in core tone. Given that these guitars are approximately half the price of the LTD and PRS models I'm looking at, thanks mainly to cheap stock pickups, I'd be able to install my preferred Bare Knuckle pickups and change all of the electrical internals to Bare Knuckle and still have some change. I'm sure the EC-401 is superb but clearly I'd be partly paying for EMG pickups that I'd never actually use.
So there it is; I'm pretty sure that the Bernie Marsden will sound the closest to a Les Paul so that's my starting point and if I can live with the neck, I'll get that. With all of the others, it's really about which one is closest to that Les Paul tone I'm after and I'll probably buy whichever one is most deep, rich and resonating. If none of them are significantly closer than a Custom 24 and I don't like the wide fat neck, I'll just get another Custom 24. Simples