You are most likely looking at Rock Shox Reba or Judy (on discount) but you'll need 9mm x 100mm quick release and 100mm of travel so you don't need a new front wheel. These are air forks, but aren't as in ready supply as they were (ever changing 'standards').
Got to love Specialized description. The XCM's are basic coil forks, and heavy. Your other main issue is you need to see if it's a tapered steerer.
The spesh site isn't letting me know that, so you can either drop the fork out and check if the bottom bearing is bigger than the top (that's tapered, and you'll see the steerer flare out at the bottom and get measuring the tube, - if one is bigger it's most likely 1-1/8th to 1-1/4, but could even be 1-1/4 to 1-1/2