reds are good, but for a longboard i wouldnt get ceramics because generally you are carving to slow down anyways. I mean if you want to go faster just find a steeper hill.
if you want good wheels, like one person said abec 11 gumballs are good. also satori big buds are very soft.
but actually my friend got a board from a canadian company called rayne, with a certain brand of wheel on it that is as soft as a gumball but even wider. also the board is unlike any longboard I have ever ridden. it goes faster than anything, never gets any wobbles, and never slides out. basically it makes normal longboards look like shit.