Lots of choices
Manitou:
Droadro (inverted, most say a DH race only fork, because of the constant mantainance)
Stance (lower end, not the best dampeners)
Sherman (some dudes like this fork, some don't)
Marzocchi:
888 (several levels, R, RR, RC, VF, etc. a good starting platform to build/upgrade upon)
Monster T (great dampeners, just very heavy)
Super T (and upgraded Jr. T, better, but not the best)
Jr. T (prone to spiking, but OK for just single hits)
Shiver (inverted, MX cartridges)
Fox:
DH 40 rc2 (the hot ticket right now, but cost big bucks)
Rockshox/Sram:
Boxxer WC, Race, Team ( some say "friends don't let friends ride BoXXer's", others think they are good, older dampener technology)
There are other offerings from Co.'s like white bro.'s and xxyyzz but I think I listed the main-stream offerings, prices range from a couple hundred to several thousand dollars.
And then there is used forks . . . (where you could get a good fork, or you could get a rock)