Have a look at the [ame="http://www.amazon.co.uk/exec/obidos/ASIN/B000VVWPQK/ref=ord_cart_shr?%5Fencoding=UTF8&m=A3GI79VBNSVFZI"]Plustek[/ame] scanners. They're pretty much the next stop down from the Nikon units, but without the massive price tag. The Ai models are the ones to get - they do infrared scanning and has the scratch removal technology.
If a few of you guys are looking into the same thing, i.e. scanning an old pile of slides once-off instead of something for continuous use, then why don't you all agree that one will buy it new, use it, and sell it off for a reasonable price to the next. That way everyone gets to use it for a fair price. Something like, the depreciation = the price divided by the number of people participating. Then sell it of second-hand and split the proceeds, or get someone who needs on for continuous use to be last in the queue.