I'm sure you have all heard a previous rant of mine but compare the "useful IQ" and the Release dates the cameras are in 2 different classes. The 2007 Honda civic isn't in the same class as an 1991 Mercedes just because it has a radio too...
P6000 - G11
D40/D3000 - Rebel XTI
D60/D5000 - Rebel T1i/T2i
D80/D90 - 40D/50D
D300/D300s- 7D
D700 - 5D/5D mII
D3/D3s - Eos D mIII/mIV
D3x - Eos Ds mIII
As a sidenote mostly only camera stores and Best buys carry D90's where I am (Best Buy also sells the D300/D300s in store). The D3000 and D5000 are what is in Cosco, Target, Walmart, K-mart, Sears, Frys and every other consumer store in between... the D90 is not.