Is 550w good for a i7 7700k with gtx 1070 or what would be a good psu
perfect psu would be the BitFenix Whisper 450 M.
that whole "decent" category is old designs that really have no reason to be looked at currently. but easy on the down votes folks.
The NEX units are old and crappy, I wouldn't recommend them over even the CX450m.
The NEX units aren't bad. As stated they're decent... They're just overpriced. If op gets a sale on one for cheaper..
I only offered it as a suggestion as op did not state there country.
I didn't think my comment would be understood :/