Richard, good point and one I actually hadn't thought of. I am quite familiar with the charts you speak of (was just using them the other day, in fact). I agree that I wouldn't be able to get a complete understanding of my environment with the 2500.
The Brunton ADC pro looks like a strong contender as well, thanks for bringing that to my attention. Looks pretty comparable to the Kestrel 3500 in terms of features. Not certified (no problem), 2.4oz (vs 3.6oz for the Kestrel), and it looks like it can log data. On the Brunton, what is the resolution for temperature, humidity, wind speed, altitude?
I definitely want reliable accuracy, so I'll probably stay away from the no-name meters. The NIST certified calibration that comes with the Kestrel unit is a plus, but not a necessity.