You have some fps games so you could get the Armed Assault Anniversary X Edition for around 40 euros, which includes the whole Arma series and plenty of additional stuff, and still have half your budget left.
For me the beauty of Arma is there are plenty of free mods (campaigns, maps, troops, vehicles, planes etc) available and coming out all the time, so you never actually complete it. And the latest Project Reality update is expected soon.
Its not for the faint hearted though - either from a gameplay, maintenance or required system spec standpoint - but you get out what you put in.
cj