if you like the expensive games... those about 60€ and bit older, I think this humble bundle you like it...
http://www.humblebundle.com/
It's about 16€ and you have a lot of games, I don't know if they are good, but I think metro33 and another like Serious Sam are good games...
Metro 2033 is different - first of all, you need to get used to the voices. Its more unsettling rather than scary which is a shame.
Some videos of it here :
Red Fraction is pretty good - completed it several times :