Something to be aware of: SCSI to IDE converters aren't per bus, they're per device. So you'd need two of them: one for the hard drive and one for the CD drive. And they're expensive. Probably cheaper/easier to grab an old external SCSI CD drive. You can't mount the CD drive internally anyway.
As for the video card, it sounds like you want an RTG card with passthrough capabilities - i.e., it shows graphics card modes and then automatically switches to an Amiga native mode if you switch to that type of screen. The Picasso II, Picasso IV, Cybervision 64, GVP Spectrum, and a few other cards can do this. The Cybervision64/3D cannot, unless you have the additional scandoubler module (and I'm not sure it fits in the 3000's video slot).
The Indivision will give you the option of some higher resolutions, but I don't think it's as fast as a dedicated RTG card. I think you also need to change a capacitor on the motherboard to get it to fit. And it won't allow you to run software that specifically requires CyberGFX or Picasso96.
