I have not checked my II folder lately.... it is up to 52gb. So much for a 128 gig drive...
Can I get it with a big SATA drive and add an SSD? Is that what you and Koby are saying?
I would go with a 256 drive (or 2, in RAID), given the size of your import items. My current AC drive is a 128, the folder uses 30GB and the II folder is 10GB of that.
The problem is, I believe, that the II folder has to be in the AC folder. It would be real easy if it could be placed elsewhere, because you could use slower (SATA) larger drives for that purpose. The other thing to consider is the backups will also be in the AC folder/Backups and can add up if you don't cull them on a regular basis.