I just purchased the Command and Conquer: The First Decade game package off amazon for $35. If you like good war RTS games, this is a very good deal, because it's 12 games in one package for very little money.
I played Q3 Excessive online for years. These days with family, job and second job responsibilities I don't really have the time to master online deathmatch twitch games. ;o{
Deadpool2k's recommendations above not only seem to hit the nail on the head for you, but are also considered to be awesome fps games.
I agree with those picks