Good work.

So..peak acceleration occurs at peak Torque then, not peak horsepower as stated above - correct?

Both statements are correct; the latter is almost aways true, but there can be exceptions.

First, the two statements refer to slightly different things. Yes, it's always true that "peak acceleration occurs at peak Torque"

__in a given gear__. However, when comparing two gears

__for a given car__, say second and third, the acceleration possible in second gear

__at any rpm __ may be higher than the acceleration that's possible in third gear. In particular, as can be seen in the charts for the various 987's, the acceleration possible in second gear

__ within the allowed rpm range __ is always greater than the acceleration that's possible in 3rd gear. In fact, examination of all the curves for all the 987's and all gears indicates this is almost always the case. This is why jake said, and I'm paraphrasing, that for maximum acceleration (meaning time to speed or distance) it's best to run the engine out to red-line before upshifting.

However, while running out to red-line almost always results in the fastest time to distance, it's not universally true. In general it depends upon the shape of the torque curve and the particular gearing. For example, see the acceleration curves for 4th and 5th gear for the 2007 987S. These curves intersect at about 120 mph, which is a couple of hundred rpm below red-line in this particular case. So, in theory optimal time to distance would be achieved by shifting just below red-line. (That assumes the driver has infinitesimal reaction time.)

To get back to your original question, I think you can see from the charts that Porsche has chosen gearings, including tire sizes, that result in placing the broadest, higher parts of the torque curves for a given gear in similar speed (mph) ranges. For example consider and compare the curves for all cars and a given gear. Look at 2nd gear and also 3rd, which is a very versatile gear on the street and at the track, as was pointed out in the above thread. The broad part of the torque curves all occur in nearly the same speed (mph) range. Note too though that the accelerating force is almost always higher for a given gear and speed (mph) range for the larger engine. (The exception is for the automatic.) That means for whatever speed range (mph) you are comfortable with, eg. obeying the speed limits, Porsche has designed the gearing such that you are able to accelerate faster the larger the engine is.

So, how much fun do you want to have at 50 mph? 0.5g? 0.33g?

Note, drivers have been known to receive tickets for having too much fun, i.e. accelerating too quickly - aka careless driving, even while obeying the speed limit.

My daily driver is a 2007 Cayman S. It's way fun - both on the street for my daily commute, and also on the track. See

2009 Motor Trend Best Driver's Car - Best driver's car competition - Motor Trend
Buy what you're comfortable with. A certified pre-owned 2007 987S is a great value and great car. However, things almost always get better, so I imagine the 2009's and 2010's also provide wonderful driving experiences. Enjoy the process of being able to select one.