Then just select a GPU card that Adobe & AutoCAD support GPU acceleration on. Add at least 8Gb of RAM. An SSD > 128Mb for booting & loading main programs. And a big hard disk for data 1 or 2Tb should get you started.
if you want to know the fastest its the i7 990x, 6 core 3.4ghz.
sandy bridge aint the fastest dude. its the fastest dethroned processor.LOL
no way sandy bridge is near that monster. but to vingalileo i dont recommend that 990x because it will cause you really big bucks. 1000usd is too much for a processor, its insane spending that much. sandy bridge is fast enough for your needs, i also use adobe and 3d max and auctocad, any intel i7 will be fast enough for that softwares, to be specific i7 2600/2600k will be the best choice.