Nikon or Canon

Next semester I will take Photography course
So I need a DSLR camera
But I still wondering which one should I buy
Nikon or Canon?

I post out this question in my FB profile
And my friends suggest me to get Nikon
D3s? I couldn't afford that
Perhaps if I am  professional I will get that when I become a pro photographer someday
But I think it will not happen
So I'm looking for D90
Which is better but still have to consider because for a poor student or begginner
It is still expensive
San asked me to look for D3000
which I can really afford
I saw San's Coolpix p5100 is nice too
but I think I wouldn't choose it even it is cute

I still cant decide which 1 should I get until now
and I don't want to regret soon if I buy a wrong camera

Any suggestion for a poor student?^^