The 4 pots are good brakes and haven't achieved their cult following for nothing. They would be great for "all mountain" type riding. For whatever reason, I have always preferred the feel of 2 piece, bolted calipers to the monoblock types. If they're in decent shape I'd consider picking them up and giving them a try - if you don't like them you won't have any trouble finding someone who does.
Having said that, the new Servo wave XT lever paired with 2 pot caliper is also a nice brake and has a similar feel at the lever to the 4 pots.