Canon DSLR's

I am in the market for a Hutech modified Canon DSLR. Any thoughts on the difference between the 350D(XT),or the 400D(XTi). It will have the type I filter(UV/IR) and be used mostly for DSO's through a W/O Zenithstar 80 ED II on an Atlas EQ-G. Other than the difference in resolution and the difference in price, are there any other significant functional differences.

Thanks,
Joe Moskowitz