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I just installed this Boyo camera -- It's really well build, brainless installation and the pic seems fine. Shop around, though, I think I got mine for about $139.
Be careful with the ultra wide angles; they get so "fisheyed" that they become usless when you're backing up close to something. But if you're just wanting to make sure you're not backing up over a garbage can, cat or whatever, you're fine.
You have to realize that most of those cameras see something like 380 lines of resolution, which is lower quality than regular old NTSC 4:3 television... so the reverse screen image is never going to blow you away with quality.
the main difference is that your image is going to be stretched... since you're not going to be recording the image and broadcasting it over the airwaves... you'll be fine :-)