no .... as p100 is not a dslr , u cant change its lens.
no the Nikon Coolpix P100 does not have a bulb setting. but you can set your shutter speed to 8 seconds, you will just have to "light paint" really fast.
Yes, the Nikon D90 Digital SLR has image stabilization.
No
yes, sure can
It depends on your preference. Canon is much more popular in the SLR space than Nikon, but Nikon users swear by their lenses.
The Nikon D7000 Digital SLR is generally acknowledged as Nikon's best in SLR photography. There top seller the D5100 is similar, excluding a few features but is cheaper with a price tag of $849, compared to the D7000 priced at $1,095.
An SLR camera is much higher quality than the Nikon Coolpix. I have owned both and the SLR shoots in much higher resolution and pixels.
Nikon d90 0r nikon d5000 is the best cameras
Nikon
Read the user guide
No