no, I've got it wrong, the 90-300 is listed as current on camerapricebuster at £140, that ones probably not 10 years old then, probably recent, not seeing reviews anywhere though, f4.5 -5.6 ??
I'd suggest stretching a few more £ and get a new 400D with 18-55 kit for £350 and then get a 2nd hand ex-kit XX-300 zoom for under £100. Have a look on ebay at the 75-300 prices (don't expect to get IS) but also check elsewhere (2nd hand dealers etc, you may be lucky with one offering an older kit lens out relatively cheap, or an equivalent sigma or tamron)
what's kerso's price on new cameras?