What program do I use to model?

What good programs are out there that i could use to model?

(User was banned for this post ("Wrong Section" - UberMensch))

XSI Mod Tool: http://developer.valvesoftware.com/wiki/Softimage_Mod_Tool

3Ds Max: http://developer.valvesoftware.com/wiki/3DS_Max

Also, you can’t just compile a .mdl file through the program, you need to use Source SDK to compile the .smd file into a .mdl file.
How to here: http://developer.valvesoftware.com/wiki/Compiling_a_model