A Tora coil fork can be serviced easily enough, and as long as it doesn't have scored or pitted stanchions it should be OK. I don't think many MTB owners realise a fork should be serviced, but there are plenty of service kits available on the 'bay, and SRAM step-by step instructions are easy enough to follow. It was a £600 bike back in 2010, but is reasonably well specc'd and well made. It's 3x9 by the way, not 3x8 as in his description. I doubt I'd want to offer him much more than £300 though.