NADA is way over rated and I'm not sure what they base their guidelines on. I have a '04 Moomba Mobius that if I go by their guidelines, I'll make more than I paid. Take the salesman for exactly that, a sale. They are not in the business to lose money. If they are offering you the killer deal dude, it's not you, it's a sales pitch. It's like the girl that tells you she's never done this before.
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It's all about if you think it's worth it. You can second guess yourself and listen to everyone else forever, but when it comes down to it, demo and if you think it's worth it, pay the $$$. That's what keeps free enterprise alive.