>>> thought all the Excel range had the RIB style V floor?
No far from it. There are only two SIBs that on here we might call a V-floor... the Aerotec and the Honwave air floors (welll plus some Honwave clones like Prowave). The Aerotec is the only SIB that carries the V floor right to the transom.
The Excel you're looking at has a flat HP floor with a LP sausage keel.
They will all get you where you are going but the feel is quite different. You may find you are unhappy trying to push a flat air floor type along with a 20hp. Flat air floors can misbehave at speed and that feel really annoys some folks.
BTW the price you pay is not my business but I hope it's a fair bit less than £3200 for the Excel/DF20A package.