you can get the reefcrystals (by instant ocean but better) for like 45 shipped for a 160g bucket.
I was on oceanic but i had a few problems w/it. mostly just low pH and calcium was sky high. Now i'm on instant ocean and my pH is better, however my calcium is now low. So my next one will be reef crystals and i'll see how that is. and also, many people will mix IO and oceanic. That will balance out the calcium levels
but like paintbug says, theres no best salt. Its just what you like and what you dont. I'm sure there's some that are just horrible tho, but anything like io or oceanic or all those commonly used ones should be good.