Managed to pick up a SF750 last week online. I needed 750w as well. Coolermaster do a pretty decent 750w (V750 SFX). But stock levels - as with most things PC atm, are awful everywhere.
I managed to get a Corsair SF750 last week Had been looking for weeks!
Thanks for the info, the SF750 is what I have on pre-order but have kept my eyes peeled for any alternatives in the meantime. I'll keep the search going!
Cheers