The T1i (and Nikon D5000, equivalent) are both very good at higher ISO levels, though I have to say that the D5000 does a better job with them.
What kind of night shooting did you have in mind? If youre throwing it on a tripod and leaving it at base ISO, you wont have a problem with any dSLR. If you plan on shooting hand-held with higher ISOs, then I'd go the D5000 route
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