You’ve already mentioned AB’s and I’d stick with them – I play CoC and the fact that you can buy them in sections gives your whole platoons individual figures throughout.
Having said that I do have a few other manufacturers in my collection and would highly recommend these http://www.battlefieldminiatures.co.uk/, a bit different in style to AB but very nice.
I would also say that Xan’s lovely stuff works well with AB (have some of his old Warmodelling kit too). I have a few PSC metals and Adler 20’s too and they are also nice.
Sorry but the Grubby/Kelly’s Heroes, SHQ and CP’s that I have don’t really do it for me and have all been relegated to the reserves!