Batu, sorry for the delayed reply - I did not notice your post!
I originally planned to use my 6mm WW2 collection with I Ain't Been Shot Mum by Too Fat Lardies, but haven't gotten in a game yet. Then I picked up Iron Cross, by Great Escape Games, and that looks pretty good too.
Oddly, I may actually end up using the WW2 rules in the book One-Hour Wargames by Neil Thomas to play some solo games before I get a chance to try the more involved sets.