I recently bought a Commodore monitor and cables from cloud9 for the Coco3. Surprisingly my newish 27inch Asus monitor displays the Coco3 perfectly with only the cloud9 RGB to VGA cable. ....and as discussed above, I can't recommend cloud9 enough.
I recently got a twin disk drive system as apparently some software only works when that hardware is present. I'm glad I forked out for the drives and controller, something satisfying about hearing the drive tick away loading software!