Do a search on dyno-plot.co.uk for dva and vkg, very easy to see that the 2.0 litre is making a lot more torque, and I suspect would get into the 270 bhp area with the correct assembly, matching and mapping.
Oily has commented on these components, so worth a search and probably a phone call for a full opinion.
I can see the point in looking for an ultimate K rather than going duratec if you already have all the other ancillaries to suit a K ie. Dry sump, exhaust, & throttle bodies, all of which would need to be replaced to convert to duratec.
Edited by - leon on 27 Apr 2014 12:59:15