Cache box configuration

We currently use a basic squid install as our on site proxy server, our LEA is suggesting that we should move to one of the proprietary cache boxes, though as always funding is a snag. I am happy with the way squid is performing, though it would be nice to add the facility to pre-load web sites into the cache. What I have in mind is a links database on our intranet, which staff can approprate links to. This can then be used to provide a list of sites that can be pre-cached. Has anyone done this, and if so how? Thanks Rob Keeling Network Manager Queen Elizabeth`s Grammar School