If you haven't seen UFO it is definitely worth picking up on dvd. Two seasons, 26 episodes in total. The complete series can be had on amazon.
On the surface, it can be very 70s, especially in set design and costume. Deeper down, the show has an edge not seen in other scifi shows. This show is not fluff and camp, it is major kick the invader alien backside story.
Being a Gerry Anderson show, the models are a joy to see.
As for the models, I like the Skydiver and it's companion sub over the Seaview, but the flying sub was a nice looking model, much like Fantastic Voyage.
I think it's time to pull UFO out and watch them again!
Ken Pugh