I would definately reccomend from AMT/ERTL the Darth Vader TIE Fighter,TIE Interceptor,AT-ST and Millenium Falcon.I have built the above and they can look as good as you want.It all depends on how much effort you put into it.These kits fit together pretty good.
Also,I would check Ebay for an AMT kit called IMPERIAL TIE FIGHTERS.In this kit you get TWO TIEs with a base that resembles the surface of the Death Star.I have yet to build it,but I have heard only praise for this kit.