Ihave the 1800 zetec and being fairly new to the Focus scene, what the power differences between the two?

Is there a massive spec difference I have the zetec version, heated wing mirrors, air con etc.

Is there anyone local to the Preston area who is willing to let me have a look and maybe a run out in one.

I am thinking of either moding the 1800 to a 2000 turbo, or just buying a ST 170. Not purely after power, the complete package, reliability comfort etc etc. Times come to make a choice, none of the local dealers have one in for a look see, so thought I'd try here.