Sorry, I'm just a newbie to all of this.
One problem with the nikon low end SLRs is they are unable to focus lenses without focus motors.
One of the most popular wide angle lenses is the tokina 10-17 fisheye. But I'm pretty sure it will not focus on the low end nikons.
So you need a low end canon, (such as the t2i or t3i), to use that lens. Or a slightly higher end nikon, such as the d7000.