The only top speed DP Pros have is in your own head - that is what they have been designed to do. I am 6'2"/ 200 lbs and ski the 193cm model. I find them moderately challenging to ski and they are certainly stiffer than the average 'big mountain ski' but they are awesome at pretty much everything except skiing slowly in deep powder (ie in trees in areas that you donot know well).
I have heard that they are going a bit wider next year anyway (94mm up to 101mm) so the extra surface area might help a little bit but essentially despite it being obviously incorporated in the design the tip can only be so flexible without then being a noodle on the harder cruddier snow so there is an element of speed required to get the float in really deep soft (smoke like) powder.
If skiing at 'mach schnell' in bowls is your thing then they make a 201cm that will handle any speeds and conditions.
Will you like them, probably - I love mine so much that if Stockli said they were going to stop making them I would buy 3-5 sets and vacuum pack them in UV proof plastic wrap so that I had enough 'new' skis to last me the next 30 years.
That said there are a lot of 'phat' big mountain skis made by the smaller manufacturers that are getting some great reviews and reps:
PM Bro - choose model & stiffness according to needs - new Brocker sounds interesting - http://pmgear.com/index.php?cPath=52...cd3d 561dd809
Liberty - Helix and Double Helix - http://www.libertyskis.com/
Prior Doughboy or Overlord - http://www.priorskis.com/skis_overlord.php
Wagner - completey custom to your body size/ shape, skiing style and skiing MO. - http://www.wagnerskis.com/portfolio/italianebony.php
Moment - look interesting - http://www.momentskis.com/