Swapping EX head - options/opinions please

Hey guys,

I've decided to replace the cylinder head on my cabby. 
It must have gone about 3 times. Not been skimmed so I would assume that's the reason why. Last time I did the job myself the valve seats were completely toast. Really bad, but at the time I needed the car urgently so did the new gasket and bolts to keep it going.

I want to change the head, but hopefully for an upgraded item. I've heard that the gti head will fit on and the injector holes need to be blocked off. Are there other models from the vw range that will fit? Eg from newer cars/engines?
Would ideally like the head to have hydro tappets too.

So of the options available, which will be the best kind of "upgrade"? I'm keeping the carb (replaced with the Weber 32/34). 

Replacing the head is needed at the moment, it is sealed but i know its toast, plus a spark plug hole has lost its thread…its also on 190k. 
In the meantime I'm saving for a complete engine replacement (will be doing a 16v conversion at some point). 
So the new head is a make do to get the car on the road for everyday use.

Any information on the options available, or personal experience from anyone who has changed the head would be massively appreciated!

Cheers!