I use M3 and H3 constantly.

Didn't like M4 and only very rarely use him to fill armour to make it easier to pose - and then often stick M3's head on top. M4 always seems somehow squashy and unformed to me.

I haven't actually tried any of the Poser guys yet as I've only had Poser since PP2012, so of course I have no content for them to use anyway. Should give them a go though.

So far as what I need for male characters..... hmm.. I dunno. A weight mapped M3 maybe? ;)