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You misread that post. He said if you DON'T care about hitting 300WHP with bolt-ons, go for 06. Implying that only the HR is capable of hitting 300WHP with ease, as opposed to the DE.
You are correct sir, I take back what I said and agree
Also, don't forget the HP measurements between '06 and '07 are according to new SAE measurements. Real-world dyno differences are in the realm of 15-20hp.
OP, go with an '07-08 and, if possible, get at least an enthusiast model (for traction control). I got mine with only 7k miles for the same price they're offering you for the base model so take a good look around to see what other HR's are available in your area first. I don't know that the difference is so noticeable from a driver's perspective, but one of my good friends owns a DE model and drove my car and said there is a noticeable difference- who knows really but the numbers don't lie.