Contests?

It is near impossible to get a base/optionless Prius. The backup camera has been available in most all option packages since the 2006 model year. Currently, all of the US 2007s (except for a few rental special order optionless ones) come with the rear camera:

Provided that you don't overly fill your cargo area, I've personally preferred the view from the rear of my 2004 Prius (hatchback) to that out of my 2001 Prius (sedan). You have a much lower view out of the hatchback, so you can see shorter objects that are closer to you, as opposed to out the back of the sedan over the trunk, where the same short object has to be much further behind you before you see it (gets hidden by trunk lid if too close). I've got the scuffs on my 2001's rear bumper to prove that it is more difficult to see over that trunk than it is out the back of the 2004's hatchback. (Sure, I have a bigger window view in the 2001, but most of the view is up high, and I'm more likely to back into a low shrub than a tall tree limb...) Appropriately aimed side view mirrors pretty much remove any rear blind spots, other than the close and low directly behind you ones.

The Intgrated (or is it Intelligent?) Parking Assist, IPA, was first introduced by Toyota/Lexus on the Toyota Prius, with the 2004 model year in Japan. By around 2005 or 2006, it became available as an option on the Prius in most markets, but has never been offered as an option on the North American Prius so far. It seems that Toyota is putting the IPA on a Lexus model as the first one offered with it in the US...