I created a guide how to get v21 earlier! (Back when v21 was not out)Step 1: Download and install this mod.Step 2: Download that blockland in minecraft texture packStep 3: Create a world in Superflat with CreativeAnd there you go! V21!
I would use this if I had a nVidia GTX 680 (or 690) instead of an AMD Radeon 6300M. Too bad I am stuck with this nettop until I have enough money. (4k? 5k? I wouldn't even mind 6k if I get a good job.)
goddamnit unless you're looking to SLI two gtx 60s you don't need 4k-6k for a computer