I'm currently facing the same decision and cannot make a choice. I would LOVE the UV/Solar setup but wonder if they are useful if I do not get more than 10 hours of sun on them during the summer and even less during the winter. I definitely want the 24hr FARS.
I could go with the cabled unit but this would require moving the Ane. and ISS
. This would make servicing it easier than on my roof but wonder about the accuracy of the readings from both units?
Remember, whether you get a cabled or wireless VP2, the ISS and anemometer are still cabled together unless you get the wireless anemometer transmitter. The anemometer cable that comes with the unit is 40 feet long so you can mount the anemometer away from the ISS. I have my ISS mounted on a 4" x 4" x 8' treated post. The ISS is 5 feet above the ground. The anemometer sits 27 feet above the ground and is mounted to the edge of my garage roof. The cable is about 75 feet long between the two. You can go up to around 300 feet of cable before max wind speed is affected. See the Davis ISS manual for further information on this cable length restriction.
Not having the ISS attached to the anemometer has saved me a lot of frustration and work climbing ladders to service the ISS. I hate heights so I'll do anything to keep from climbing ladders or getting on my roof
You can go to my CWOP data quality page to see pictures of my setup - http://weather.gladstonefamily.net/site/AS061