Im not sure if you want to shell out, but i found this to be very helpful.
http://www.sequoiagames.com/fpsc-toolbox
Bought this about 2 weeks ago, i havent had as much time as i would want to really test it, but it is very very useful for importing. Especially since it short lists everything you need for it to work. All that you need is the .x file after that you use drop down and broswe menus to apply scripts, textures, properties and animation lists. It runs on a stable GUI and you'll know if youv got problems with the .x since itll crash on export. Not the best time to find out i know but it saves hassel of fpsc crashing. The 3d viewport is a nice indicator and shoed the model scaled. you can also reposition, scale and rotate the model inside this port for final tweaking. So far ive used the character and entity parts, the segment and weapon are a mystery but ive heard only good things from them.
jesus i sound like a salesman lol.
Bullstock is a trusted member so thiers no worries, search the fpsc forums for it. You can buy each of the four programs seperately or buy the bundle for $10 less and thier all incorporated into one.
Im on a whim right now so,, ehh