What program to use to make models

i want to know what program to make modles for my gamemode i am working on and for maps im trying to make the first warhammer 40k gamemode it will be class based kinda like battlefield 2 but some special objects and this and that

“models” maya, 3d studio max, blender, xsi… theres tons.

ok thx but does anyone think my idea might work or are there any warhammer 40k fans out there

[editline]01:17AM[/editline]

someone needs to make a size guide for weapons and soucth thats my new problem like what uis the supposed to be size of weapons and tanks and things like that