I'd love to make a armored Techpriest model but how am I going to accomplish that without using the Typhus model as a base?
Sorry, what?
Seriously, though: GW is not the only company to make 54mm models. I have models in my collection from Andrea Miniatures and I'm also paying close attention to Pegaso Models. And go take a look at Pizarro Miniatures new Ogrum model - whoa!
Plus, there're other occasional ranges, like the LOTR 54mm range (not from GW). I turned a wraithlord into a techpriest Dark Mechanicus:
Like I said, it forces you to use your imagination.
But even if you want to restrict yourself to GW minis (as you have to to take part in the GT in December), there are loads of options. Check out this classic Ogryn model that's now Squat engineer in my rogue trader's crew:
(He actually has three arms, that each attach to his bionic arm with small magnets)
Then there are loads of other options. The daemon prince models make great chaos magi. The new spawn work fine at 54mm. I've converted Buhrdur into a mutant chief. And whilst the existing range is smaller than it was (and smaller than it should be, IMO), it's still got some great pieces in it that mix and match beautifully. The lack of power armoured characters is hardly an argument against using the existing range!!
Regards,
R.