I used to sell booze and I've drunk a LOT of vodka. I mean a lot... so much that I don't drink any more, lol. For the quality of Grey Goose at a better price, try Smirnoff. No shit, I kid you not. Blind taste test it.
Best vodka I ever ever had was Ciroc. Made with white wine grapes. Lightly sweet, even. Totally awesome on the rocks.
Not that I'm a vodka guru, but I hear Skye is pretty damn good.