DSLR recommendations for photometry

Hi All,

my Canon 450D DSLR has served me well for photometry for about 18 months but the USB connector has broken. The Canon service engineer will attempt a cheap repair but suspects it may require a new main circuit board. If so it would be more than half the cost of a new 600D body.

I would appreciate comments (positive and negative) from anyone using a 600D for photometry. Has anyone measured the spectral response of this model?  

What other camera models are people using? Is there a preferred one, and why?

Thanks for your help.

Mark