A-Bolt I or II? The II is slightly better, really like the smooth bolt but I am kind of a Browning guy. Value is probably in the 550 range, maybe a hair more because of the caliber. Go to Gunbroker.com and search on your gun, you'll get a very good idea of the street value.
Most of the A-bolts lend themselves to handloading as they can take a bullet loaded out fairly long.
The high cost of the X-bolt is making the A-Bolt's more valuable, at least in my opinion.