i am university student and need my device to be highly portable. but i am confused to buy between ultrabook or laptop or hybrid devices. i have my eyes on vaio flip/vaio duo 13 and surface pro 2...can you help to decide. i have to run 3D CAD modeling like ProENGINEER, CREO, AutoCAD and MathCAD as well. will they run smooth in these devices ?? they say to have only 2 cores and my college has quad core devices to run them. and even in them very rarely these programme freezes while i am assembling large 3D files. those desktop are Quadcore i7vpro; 2GB graphics and 4 GB RAM desktop in my college....i don't play pc games so i basically need my new device for my 3D works and office and surfing the net. so what should i buy (among these three i like surface most for its portability and tablet like aspect)...??