Someone is selling a 550 Mhz TiBook. Its got 768 Megs of Ram, a 60 Gigabyte hard drive, a fairly new battery (fourish hours charge), and an Airport Card. I'm thinking of offering $450 for it, sans Airport Card (I've got a PCMCIA card which Panther recognizes as an Airport Extreme card). Would that be a fair price? Too much? Too little?