Thanks guys for the comments, I now get the sense of which flash I should look for. As for the lenses i'm not sure yet ahah. I saw a pack with 55 1.8/28 3.5/135 2.5 (plus another black kx camera etc.), i think i can manage for 150eu. I'm very tempted. But as Dcshooter stated : the 50mm 1.4 can do pretty much everything the 55mm 1.8 does, with a little bit extra in specific situations, doesn't it ? For example Gofour, you said you started with the 55mm, but now if you go out with a standard lens which one do you pick the most ?
In the hand to hand market in France there isn't much price difference between the two. I mean it's around 80eu for 50mm 1.4 and maybe 60 for the 55mm. Still have to think about it i guess.
As for the M 50mm 1.7, i'm kinda OCD with K series lenses. I figured i wanna go full K. I guess i can blame Gofour for that.
Though it's a great lens, I think my copy is in bad shape, I got it for 10 euros ... But some of the picture dramatically lack contrasts. And since i need to pick another one I thought i'd rater go for a K lens.