yep, get the NJP.
To put it in perspective, consider the attached PE curve from
http://daventura.xoom.it/daventura/s...icoPE_GPD2.jpg. That little hiccup at 400 seconds has about the same peak-to-peak error as the total PE (whole cycle) of an NJP (or even an EQ8 for that matter). The GPD2 is good for it's size, but it is not in the same league as the bigger mounts.