The other compact .45 is the CS 45. A little smaller than the 457. The 457 and CS 45 are both value series guns just like the 908. The 4513TSW is more refined and will cost more even as a used gun. They are fine pistols though. The 4513TSW has a rail on it unless you can find an early production gun w/o the rail. The pre rail guns also lose 1 round from 7 to 6.
Left to right top to bottom:
910 457
5906(in holster) CS45
4516 all steel. Great little .45 but very heavy for its size.
And the 4513TSW.. I don't have them all together but the 4513TSW and CS45 are pretty close to same size. The 4516 and 457 are the same size and a bit larger than the 2 just mentioned.