Quoting KiNgMaRtY:
I used 680 Denso's on my Buschur 20g at 21 psi on 91 pump gas. Very little room left
i had a set of PTE 680s with my VPC/GCC & 3-bar MAP combo... 3052 at 27 psi running 10.8 - 11.0 AFRs no prob. at only 42 psi base pressure.
if youre using DSMlink, no reason not to use 1000s. tune out the difference, and room to grow if you decide you want a larger turbo.