Don't forget to try the Cosworth one out keeping it in the Plus 4 area - Henry Williams has a couple in stock at the moment.
here he also has a baby blue SS on site for direct comparison..
Here is a new listing - a 2.5Ltr Omex Plus Four.. just for variety

This car could be the best tuned and thoroughly sorted Plus 4 around I'd definitely try this one out if I were you.