That's better than the machine I'm using here, and that's running XP Pro with no bother at all.
I paid £1200 for this thing, only last century. It's nowhere near obsolete yet!
I'd be inclined to stick it on Ebay with a good description, a reserve of about £125, and an opening bid of £1. Make it as short an auction as you can (3-day is minimum, I think) - nobody looks at stuff till the last day or so anyway.
Ebay usually finds the value of this kit, and I've been pretty happy with purchases and sales on there.