thanks all for your opinions.
i do understand that a FF dslr is better for low-light conditions.
i'm actually just a newbie in photography, i do not particularly focus on any gene of photography. so basically i snap everything, or i should say anything that catches my attention.
sometimes i snap wildlife and animals, which prompt me to consider 7d or d300s due to their high fps they give. at this point of time i haven't really snap portraits or landscapes alot, but when i do, usually there's good lighting so i guess it's still ok not to have a FF dslr?
i asked about low-light condition was because i find myself having the time to snap photos mostly at night.
i do have a tight budget so i didn't consider 5dmkII, d3s and d700.