Yeah that silver one looks cool. Must be new or something. Either way all their lasers are insanely inexpensive. Although I have never had one from DX, I heard the quality is not that good.
I think the silver one is the silver-style NewWish.
The 20mW one looks just like a Spymode, so I'd beware. Spymodes seem to be infamous for having no IR filter at all, as well as being of very poor quality.