So I'm debating upgrading my XT to a 20D or 30D. If I decide to, I'd be selling my XT+kit lens and buying a 20D or 30D body only. My question is, what would be fair pricing on these? I've looked around some and seen the XT going for about 400 used, the 20D for about 600, and the 30D for around 700. Are these fair prices, or could I get a better deal on them?

