I'm not really sure how much it'll go for, but judging by the 175Mhz that's on ebay I expect to get at least £85 and hope for over £100.
I had been storing it to use when OS4 was released. But I've hardly touched My A1200 060 in months and I've had an AmigaOne for a few years already. I though it'd be better to let it go to someone who'll actually use it.