The Peter Cushing problem is due to both his films being non-canonical adaptations of existing BBC series. In both films he isn't alien and his actual name is Dr. Who. Whatever the case I reckon both to be very fine films, especially the second one, Daleks Invasion Earth 2150 AD (1966), which not only features Bernard Cribbins in his first Who-related role, but also some of the finest spaceship SFX of pre-CGI era - FX that would give even the brilliant District 9 a run for its reportedly low budget. I even went to see it back in 1982 at a childrens' matinee in Newcastle just so I could bask in its Techni-Color glory on a big screen.

Prefiguring Katy Manning's legendary soft-porn Dalek shots of a decade or so later, Cushings assistent Jill Curzon stripped down to her utility underwear for a publicity shot:

http://weirdflix.com/blog/wp-content/uploads/2012/08/Daleks-InvasionEarth1.jpg