GURPS Essential core books

[Gollum]

Originally Posted by Refplace

For Survival Horror I would go with High Tech, Low Tech (possibly, especailly if they do a lot of low tech scrounging) and Horror not only has monsters and such but a lot of ideas on running different kinds of Horror games.
Martial Arts is also a strong candidate.

For the next one...
The Transhuman series is worth a look.
Cyberpunk, couple of Pyramids and possibly Ultra Tech.

I fully do agree with Horror. It will also give you specific rules for fright checks and sanity: stress, derangement and corruption.

And you will even be able to use these rules in your Transhuman space campaign if you want to add a gloomy atmosphere to your games... After all, cybertechnology may affect the human psyche (especially when modifying the brain)!

For Martial Arts, I would say that it all depends on how detailed you want your combats to be.

I'm a martial artist in true life and, though I bought it, I rarely need Martial Arts rules. Basic Set rules are already very detailed. But, of course, if you want a lot of combats, with very detailed warrior characters and many harsh and realistic (or, to the contrary, heroic) options, then Martial Arts will become a mandatory.