I have a Davis Vantage Pro 2.  It's a pretty good/decent system.  I upload the data to weather underground so I have historical data.  It's nice going back a few years and see how the weather was.

The only gripe I have about it is this:  It has been unreasonably cloudy lately.  So much so the solar charged battery isn't keeping a charge up and it "disconnects" from the internet.  Very annoying to say the least.  My wife bought it for a birthday present but hindsight wish I would have gotten the "cabled version".