If i were you I'd go the 450D.
Keep in mind the standard lenses that come with the cameras are pieces of junk... and getting a good quality lens for astrophotography is recommended.
I polar align using my EQ6's polar scope, then using my telescope, drift align to get as close as possible to the SCP.
Using a shutter release on my 350D i've taken a shots at nearly 4 minutes without guiding...
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