[sisforsurfing]

50mm f1.4 on a crop body sucks for general low-light shooting IMO. Get the 35/1.8 if you go DX Nikon, 35/2 if DX Canon. You'll be able to handhold them to the same exposure and it's a better field of view for walking around.

I say go with what Chris_PA said, that 5D kid can't be beat for the price.
If you NEED better autofocus than the 5D, or want a better burst rate, get the used D300, 35/1.8, used 80-200, used wide angle (take your pic), and SB600 if you want a flash. Plus you can use it with CLS which is cool.
Slow normal zooms are boring. With a fast 35 (DX) or 50 (FX) you'll be set in the normal range.