I really love the actual ships from the movies and have pretty much limited my purchases to the more traditional A, B, X and Y wings, Tie fighter, advanced, bomber and interceptor. I am looking at buying the K Wing for the Twin Laser Turret upgrade, and was wondering what other really good cards are out in what models.

Starviper for autothrusters is the first to come to mind. Transport might be good if you want R5-P9. The falcon has a few upgrade cards and the YT-2400 comes with HLC (heavy laser cannon). You can also get that from the Firespray and it'll come with a stealth device. I'm sure others have better suggestions.

K-Wings are a good choice, as TLTs and Extra Munitions are both very helpful upgrades. The StarViper is a good buy for the Autothrusters, which are very good choices on A-Wings and Interceptors.

If you haven't yet bought the Rebel and Imperial Aces boxes, I would highly recommend both of them. They improve your A-Wings and Interceptors immensely, and they also give more options to B-Wing pilots.

The Imperial Raider has some very strong cards for the TIE Advanced, but it's a very expensive box to buy for just those cards. I would try to buy them secondhand if you aren't interested in the Raider model for Epic games.

Khirahxz fighter has crack shot, lighting reflexes and predator wich are some of the best EPTs, if you play rebels a lot the transport is full of really useful astromechs and comes with an x-wing and some pilots finally with the HWK and the phantom you should have some really solid generic crews.