Check Jupiter's moons. Io, Europa, Ganymede, and Callisto should be habitable, with some infrastructure or terraforming to give them atmosphere.
I finally braved the jump gates again. This time I learned my lesson... sorta. I equipped a cheap "Jump Explorer" with a single engine, a jump engine just barely large enough to get that ship through the warp, and a small gravitational sensor. Since I'm playing with realistic stars off, I got some really weird solar systems. The first one was a single planet with 40 some odd survey points. I may explore those with mark 2 gravsurvey ships, but not now. The second was was most promising, 2 viable colonies with no visible sign of precursor or alien life. The third had two wrecks, and being foolish I decided to investigate. My survey ship ate a cluster of 4 size 24 missiles.
I have a feeling that that was a Precursor PDC, since my active sensors would have detected an actual ship. It really sucks, actually, that planet is perfect in terms of temperature and gravity and close on atmospheric pressure, I would just need some infrastructure for the gasses (methane and sulfur dioxide, nasty stuff). On the bright side, there's another less suitable but still viable planet that's a few billion km away from that planet and closer to the rest of the galaxy, and both the second and third galaxies have plenty of asteroids to search. Now I just need to get my civilian lines to actually build cryotransport ships. You're sure you don't need to tool a shipyard to build them?