What vodka brands give the least hang over?

So I read that vodka is the best drink for hang overs. That is if its not the cheap stuff. So I decided to try drinking vodka and gatorade. Gatorade because of the electrolytes. Instead of buying the cheap stuff for 9$ a bottle, I went for 13$ a bottle. I looked it up and smirnoff (13$) triple distills and filters 10 times. Grey goose is 60$ a bottle and they distill 5 and filter 6x. Now I read that the more expensive you buy the less impurities therefore giving you less of a hangover. So now I ask how much less of a hangover will you get from say a 8$ bottle to a 13$ bottle to a 60$ bottle like grey goose. What the heck am I supposed to be looking for? Where is the cut off point to where its really not worth it to spend anymore?