but not sure wich one.

My Sierra's engine (1800 cvh) is any day about to give up the ghost, so I am thinking of a new engine.

What do you guys and gals suggest?

I was thinking along the lines of

2 litre Pinto (mildly tuned)
2 litre Twincam (Standard form until I want more power)
2 litre Zetec (standard form until I get used to it)

failing this I might just get a newer Sierra, but mine is very tidy bar the engine slowly dieing and she means alot to me so im trying to avoid this option.