I thought your questions were pretty well answered in the last thread?
I'd say if you're mostly riding groomers then start with the Proto 154 - compared to riding an old cambered rental board it's as forgiving as anything - hell - it's forgiving by any measure! But the Proto will keep you more stable bombing groomers. Where (I think) the Evo is capable (-itallics) of bombing groomers it only makes sense if you are a more accomplished rider! For a relative newb you might find it throwing you around a lot.
Then when you are bored of pissing down the slopes and want to head to the park a lot more get an Evo 152 (IMO)
I have the Proto and have ridden the Evo a handful of times and totally adore both boards. The Evo is the funnest board I have ever ridden. But I freaking love my Proto! Solid board!
If it's a real goose, is it propaganda?