If all your wanting is speed and you have the money, go with the Alpha-211 with a 250XS or even a 300.I have a 199 with a 225 Pro XS and the best I've gotten is 74.4. I could get my 27p Tempest balanced and blueprinted and probably pick up 2-3 mph, but I haven't gotten around to it.
Steve is getting nearly 80 with his 21 footer with the 250XS.
I would think 70+ in a 19 footer would be like running nearly 80 in a 21 footer.

Ecc. 10:2 - The heart of the wise inclines to the right, but the heart of the fool to the left.