I'm a CC2 Pro user, and I can vouch for the quality of their products...Cosmographer has been a loooong time coming for us sci-fi gaming types.
A word of caution, though...CC2 Pro stuff has a rather steep learning curve for those unfamiliar with an autocad-type of program. It can be frustrating as hell at first...but if you stick with it, you'll realize it's a top-notch product with a lot of power to it.
The CC2 Pro program used to cost more than $70USD...but they've slashed the price and made it LOTS more affordable.
I've used AutoRealm and Dungeon Designer in the past...but the more I use CC2, the happier I am I made the investment. Again, it's NOT for everyone, and if you DO decide to go with it...be prepared to spend some serious time learning the system.