The JLMOC cutters by Hurst actually have 156,236LBS of cutting force and weigh 44LBS. Have used this tool too many times to count and love it. I know it means little in this discussion, but I just like to prove Brooksie wrong.
As stated before, Res-Q-Tec (
http://www.resqtec.com/ makes some nice tools. I got to play with them at Harrisburg Expo but would love to have a chance to cut with them. They are putting out some amazing numbers for a 5,000PSI system.
G2 cutters: 21.2 LBS and 76,409LBS of cutting force
G4 cutters: 28.1 LBS and 109,669LBS of cutting force
G6 cutters: 38.9 LBS and 281,140LBS of cutting force
X4 spreaders: 46.1LBS and 226,980LBS of spreading force with 16,383LBS of pulling force that have a 27" max. spreading distance
X4S spreaders are the same specs just you get 32" of spreading distance