You won't catch a break buying online. I bought my 151 last year from evo, but only because it was already January and despite having two local NS dealers (this is in Baltimore, too), neither one had any Evo's. I still paid full retail, $489.
I would go shorter, 152, personally. The new blunted tips mean the decks ride longer than last years (the 150 for '11/12 gains a cm effective edge over the 151 10/11 and the 152 gains a whopping 3 cm). I never had any problems riding 151 all over except it was a bit sketchy on landing bigger jumps (30+ ft) but that's more due to the damping and flex pattern. The Evo wasn't really designed for sending it over the mega booters, but it will do fine on small to medium features.
If you want a do it all board in the park, I'd go with the Proto-CT. The flex pattern is purportedly a wee bit stiffer, a bit more damp so you might have to work a little bit more for your presses but there shouldn't be anything in the park it won't tackle. Honestly, unless you want to tweakiest, butteriest deck for the most technical jibbing, I think the Proto is a better choice. I would have taken it over my Evo.