I will be moving to an ITX build in steptember/october. Hopefully skylake will be available and I can do a mostly new build. Curretly I have a Corsair RM650 ATX PSU. I'm pretty limited for small cases but the silverstone SG13B-Q MINI-ITX has caught my eye (£30 in China) but I'm not sure if my PSU can fit. I was reading up on the SX600-G 600W but it is £80 and not rated that well compared to others in the ATX form factor. This got me to thinking, what about selling my RM650 and replacing it with a shorter ATX PSU. Would this give me more case options or will my RM650 work fine in this case? suggestions?