Definitely get a SFX and not SFX-L or ATX power supply if you can, if you're inclined to smaller ITX builds. I'm extremely happy with my SFX Corsair SF450 inside Sugo SG13B.
Reminder, a normal 7700/1080 ti build can fit comfortably in 450Watts. FYI, SF450 is 80 Plus Gold rated
, so lazy math, it gives 450W to PC but would be pulling 517W from wall.
There are overclocking CPU/GPU scenarios where that's not enough. Those last few FPS/% points increase power usage massively. Not that i ever came close with gtx 1060/i3-6300/6x2.5" drives plus one 140mm case fan. Ive never seen the PSUs fan come on
I did hate the SATA drive cable though. But, i've been making my own power cables for cleaner build since almost beginning. So keep that in mind.
edit: almost forgot, only get silverstone pp08 sfx-atx adapter(same as Kingwin KWI-SA-08) if you need one. vents, adds more CPU cooler clearance if its that type of case.