No, you don't need the Pro if you're just cutting 8.5 x 11 papers.
I'd still suggest getting the Pro, tho...It will open so many more avenues for you.
The problem is that Graphtec CraftROBO's (not Pro) and Roland Stika's are that they really are hobby machines with limited capabilities.
Of course, you could start with a CraftROBO and upgrade later when you're ready.
Low cost vinyl cutter w/optical eye 
