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Just to add some info on amp glow.
Canon improved the amp glow handling of the cameras after the 300D.
While it is present on the 20D/20Da on long exp, if you use ICNR on, my understanding is that the camera switches off the amp during the long exp resulting in a cleaner frame.
Below are some dark frames I took using the 20Da and one from the 300D.
All were done at 20C ambient temp.
#1 = 20Da, 10 min, no ICNR, 800 ISO, RAW
#2 = 20Da, 10 min, no ICNR, 800 ISO, RAW stretched in PS Exp +4, Brightness +150
#3 = 20Da, 10 min, ICNR, 800 ISO, RAW
#4 = 20Da, 10 min, ICNR, 800 ISO, RAW stretched in PS Exp +4, Brightness +150
#5 = 300D, 10 min, no ICNR, 800 ISO, RAW
#6 = 300D, 10 min, no ICNR, 800 ISO, RAW stretched in PS Exp +4, Brightness +150
The 20D is still considered a great camera body for terrestrial, some prefer it to the newer 30D in terms of noise performance.
The 40D IMO is a great DSLR, 2nd only to the FF Canon 5D in the prosumer range.
The 5D BTW is set to be replaced soon but in terms of performance it is the best prosumer Canon body released by Canon to date with noise performance approaching the 1D series bodies.
The live focus on the 20Da is a dream to use and would be the same on the new 40D.
If I was to recommend one for you now, I would recommend a modded 20D or better still a modded 40D with Live View and 14bit Digic III processor.
Next would be a modded 350D and after that a modded 400D.
The new Canon 450D is rumoured to have a non removable CMOS filter which will make it unsuitable for modding if it is true, but this is still unconfirmed.
Good luck in whatever you choose Fahim.
BTW if you haven't settled on Canon gear I would also consider getting a Nikon D300 modded by Hutec but I have no experience with Nikon.
For Terrestrial the D300 is a great body with superb performance.
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