So GPU aside, with i7 3770K it's guaranteed the processor won't be the bottleneck for playing AND broadcasting in max settings at the same time? I insist because it's my top priority and I don't want to miss it.
I'll get 16gb RAM cause yeah it costs nothing. 4*4 or 2*8?
Any of the P8Z77-V is good? Cause it kinda goes from 100 to 250€.
For SSD what is the best/most common connection? Sata3? It's better to get 128gb now and potentially another one later, or directly 256? I heard it might be better in the long run to have OS in one and games in another?
What about the case?
But overall, you think I should wait next year for the new GPU to come? When is that? Or is it just for AMD, which I'm not interested in the first place.
The 3770K will be more than enough. I do all of that with an i5 3570K and it has no problem keeping up.
P8Z77-V is good, so is the P8Z77-V Pro. The Pro has a slightly upgraded power delivery system but unless you're overclocking the vanilla one will be fine.
SATA 3 definitely. OS and Games should go on 1 SSD, and all your other stuff (music/movies/documents) on a larger HDD. If you can fit everything on a 128GB (i do) then that is the cheaper route, otherwise 256GB drives are pretty affordable as well. Samsung's 840 is a great drive and so are the Crucial M series.
Cases are more personal preference. Just get one with good cooling. Also make sure to get an upgraded cooler for your CPU. The Intel coolers these days are just pathetic.
New GPU's will probaby come out late Q1. If you can wait then do it, if not get a GTX 670.