Giordano and Colaiacovo are good. Franson has a really nice upside, he could be really good, especially since it's a keeper league. So for this year, that's 4 D-men right there (with Pitkanen), I'm guessing your league has 6 D-spots.
Salo tore his ACL over the summer and will be out a while and he gets hurt a lot anyways, so he's probably not worth it.
I don't really know a lot about the other guys you've listed. If that J. Erikkson guy you listed before was Jonathan Ericsson from Detroit, he could be good, but he's really struggled last year and this pre-season.
Keep an eye out early in the season if Marc-Andre Bergeron signs with someone, and grab him if he does.