G-Mod?

[shorty3838]

Im concidering buying G-MOD off the Steam Store, firstly it is available to buy as a bundle if you havent got a source engine (in my case i havent) so ill have to buy either;
Counter-Strike: Source + Garry's Mod
or
Garry's Mod + Team Fortress 2

wat would you recomend?
(also are both Team Fortress 2 and Counter Strike: Source compatable with G-MOD if you dont already have a source engine to power it?)

& also, ive played the G-MOD before and found it difficault, but is it a game thats better once you know how to work it all?