I need to get an obd2 scanner. Anyone recommend one? See everything from $70 - $400 units. I know the cheap ones just read out the code and you look it up in a book or online. The more expensive ones read out the definition for you. Is there any other difference between them? I need to read out a code on my SUV but will use it in the future. Know I can get one online but would like to get one locally. Thanks for any advice.