You can buy all ships (except nation/faction specific) everywhere in the universe.
How about ... not.
Nation/faction specific ships can be bought only in nation/faction space.
Lets get rid of damn universally available variants and make them all nation/faction specific.

This thread: http://www.vendetta-online.com/x/msgboard/3/9913
may (or may not) be of interest to you.

Yep, thats it Phaser, ty. :)