Hi, i need some suggestions. I currently have xsi.
My friend is selling his canon 40d, EF 28-135mm IS lens, and 8gb CF card for $700.

reason to upgade: (these is from what i read online)
40d have 3200iso , faster AF, feels better in hand.

reason to keep xsi:
it is 12mp and should have better image quality.
18-55mm is better lens than the 28-135mm
and save some money.


please give me some feedback if you use a 40d before.
thank you