Do colony ships build too quickly?

[apache]

Well, personally, I would rather make all ships much more expensive based on class. I really think its too easy to build a whole bunch of warships real quick.
I also think that maintainance is a little askew. It should be much easier to maintain a large fleet of escorts rather than a small fleet of Dreadnoughts that both cost the same amount to build. Of course, this might cripple the AI since it only builds dreadnoughts once it gets them.