I'm thinking about trading my iMac (500 Mhz G3, Indigo)in at Powermax.com for some credit on a refurbished dual G4 and then getting an apple instant loan for the difference. Has anybody had experience with powermax? Is it cheaper through them or through apple as far as refurbs go? And what are your experiences with the instant loan. Would it be safer for me to get a credit card? This is my first time doing anything like this. I really need some good advice.