With the used market the way it is today, I wouldn't pay more than $500 - 600 for it depending on condition and what mods may have been done to it. However, it's worth whatever someone else is willing to pay for it.
My bad, I didn't look closely at the pups and just thought it was a modded American Tele. If it's a "Johnny Greenwood" Tele Plus Deluxe or whatever they called them then it's worth more than I stated.
It a Telecaster Plus as used by Jonny Greenwood until 1995 when Radiohead's gear was stolen in Denver, not a JG signature guitar. I've seen these go on the bay for anything between $500 and $1,500.