I would interject that If "I" was buying a chainstitcher it would be a W&G only. Their locking chainstitch is VERY strong and with some patient watching, the handcrank version can be had for as low as 100-300 They are SO silent, smooth, and lightweight.
The best more modern (non-featherweight) solution I know of is a Singer handcrank on a Bel-Air Bantam. It is a Singer 99 clone (3/4 Size) and aluminum body so very light.