What engine should i go for!?

nope! exactly the same mate.  Its the same block just the 9a has been bored out from 1.8 to 2.0 ltr.  If you can get the 9a then get it, makes the KR (1.8) feel slow.

Okay, engine conversion aside, how hard would it be to convert my 1.6 carb to injection? (By the way thanks for all your posts on the engine conversion matter).

harder than converting engine  to a  gti

i have a 18 16v with all the trimings if your intrested offer me somewhere around £300