what game to buy

Im gonna buy a new game now, but im not sure which one..

i think ill buy one on Steam.. and i dont have COD2, so thats a game i can buy..

are there any other suggestions what i should buy?

anyone got some hints of which game is good?

games i can see on the list thats looks ok:

Medieval 2 <-- i got it, but not multiplayer.. is it worth it to play online?

cod2 <-- aint got it

X3 reunion <-- dunno what it is

Gun <-- dunno what it is

Vegas makes it big <-- dunno what it is

Half-life 2: lost coast <-- aint got it

688(I) Hunter-killer <-- dunno what it is

GTI racing <-- aint got it

Iron warriors: T-72 tank command <-- dunno what it is

FLeet command <-- dunno what it is

Flaout 2 <- aint got it

Jagged Alliance 2 GOLD <-- dunno what it is

Space empires 2 <-- dunno what it is

Birth of america <-- dunno what it is

Half life 2 <- aint got it

Shattered unions <-- dunno what it is

Race - The WTCC game <-- dunno what it is

City life <-- dunno what it is

Heroes of annhiliated empires <-- dunno what it is

Dark messias of might & magic <-- dunno what it is


please help:>