I don't know anything about PS helmets, but my concern would be the helmet lining. It sounds like it just uses some minicell foam for fit. The foam lining is a big part of impact absorption. EPP tends to be the gold standard for multi-impact foam like you want for kayaking. For rafting multi-impact may be less important as I would think you're more likely to be worried about one big hit falling out of a raft.
The fact that your buddies Trident was smashed up doesn't necessarily seem bad to me - depending. Especially on a composite shell, cracking is going to be part of the impact absorption.
Anyway, Sweet, SR, and WRSI seem to be the major and most popular players. For helmets though, you really ought to go try it on to test fit. I found Sweet helmets just don't fit my head very well. I find the WRSI occipital lock being part of the same system as the straps annoying and harder to adjust (plus I think they look kind of goofy). So I've gone with SR. Even though you pay a bit more, the light weight of the SR carbons is pretty awesome.