Here are four links to products that cover the price range from cheap to "ouch"
HP at £100
Visioneer at £50
£250 HP does negatives
Good Epson compromise but £200
Although its fun to have a transparency adapter, don't expect too much from it. The grain always looks worse. Negative scanning is OK with a good software that will reverse the image.
For illustrations from magazines etc, see if you can get a package that will allow "descreening"; that is, it compensates for the patterns of dots that make up the pictures. When these are scanned, you get a moiré pattern unless you "descreen" them.
Matt photos don't scan very well. They tend to scatter the reflected light. Best is gloss.
Adobe Photshop Elements Ver 2.0 is excellent software for editing the results. There are others.
You will have found an excellent way of losing hours and hours of your spare time!