Hi Tony, and welcome to the WXForum!
Be sure to take a look in the Mac specific sub forum here:
http://www.wxforum.net/index.php?board=114.0 And especially my thread on Mac weather station software:
http://www.wxforum.net/index.php?topic=17584.0Each of the three most-used applications list which hardware they work with on their site, and all three can be used free for a limited time. All three are also similarly priced at $60-$70. Try them out and see what works best for your needs. Once you settle on a hardware/software package, be sure to join the developer's user forum. They offer a lot of useful information and friendly people (although the WeatherSnoop forum is not nearly as active as the Weather Display or WeatherCat forums; two or three posts per month vs a dozen or so per day.) All three developers are active on their respective forum.
Let us know if we can help in your decision,
Steve
[EDIT] Current hardware list from each vendor's page:
WeatherCat is designed to work with the following hardware-based weather stations:Davis Vantage, Vue, Envoy, Monitor and Wizard stations. WeatherCat also supports the WeatherLinkIP data-logger.
La Crosse WS23xx range of stations.
Oregon Scientific WMR 928/968 stations.
Oregon Scientific WMR 200 stations.
WeatherHawk stations equipped with an IP server module.
Fine Offset WH1080/1081/1090/2080/2081/3080/3081 stations. These stations are often rebranded under a variety of names, for example Ambient Weather WS-1080 or Watson W-8681 please see our Wiki page for more information:
http://wiki.trixology.com/index.php/Fine_OffsetWeather Display can be used with the following weather stations:the Huger/Radio Shack/Oregon Scientific WM918/WX200,WMR-918/WMR-968/WMR-928N,WMR100,WMR200,WM-900H,63-1016,WMR300
the Davis WMII, Wizard III, Grow, Vantage Pro/plus/6161/VP2/Vue etc (with datalogger), supports soil temperature/moisture/leaf wetness and UV/solar (extracted data from logger too)
the ELV/Conrad/Huger WS2000/WS2010/WS2210/WS7000/WS2300/WS2305/WS2310/WS2315/Hyundai WS-05/WS2500PC/WS2510/3600
the La Crosse 2010,2110,2210,2308,2310,2315,2300,WS23XX,WS2350,2500,2510,3600/3610 (note, history data does not work with W7)
the Peet Bros Ultimeter 100,500,800,2000,2100 and II
the Maximum Instruments Weathermax (with datalogger)
the Metron UWS 3000-ws
the Rain Wise WS2000/MK III (with data logger). Now supports the new CC-3000 data logger and IP-100
the Dallas 1 wire weather station (and version 3)
the Texas Inst. WR-25 and variations and NWS
the Heathkit ID -5001
the Climatronics Ultrasonic
the Novalynx WS-16 Weather Station
the Capricorn 2000. Now supports the new micro server
a ASOS station and a RAWS station
the Weather Hawk /Weather Hawk IP
the Environdata weather master 2000
the Kestral 4000
the Instromet
the Inspeed Vortex anenometer
the Vaisala WXT510/520 ultrasonic station
the HoneyWell TE923/Irox Pro/Nexus USB
the ELV WS500/La Crosse WS550 USB
the OS WMR100,WMS200/200/WMR88/WMR180 USB
the IRDAM station via TCP
the WH1081PC/National Geographic/Zephur/Fine Offset/WX-2008,Watson/Ambient WS-1080/1081/2080 USB station
the new Davis IP data logger (direct connection for Live data)
the Airmar Ultrasonic GPS
the new AAG TAI603B 1 wire station
the new Hobby Boards ADS speed/dir board
the new La Crosse 2810 (via the curdat.lst file updated by Heavy Weather software)
the Weatherwise Pro WS-1081, Solar powered transmitter and the WH3081 with Lux and UV sensors the Acu-rite 5 in 1 01025/01035 with USB
Weather Snoop Supported Weather StationsAmbient Weather WS-1080/WS-1090/WS-2080
Columbia Weather Systems Capricorn 2000EX
Columbia Weather Systems MicroServer
Davis Vantage Pro 2 (USB/Serial/IP Data Logger)
Davis Vantage Vue (USB/Serial/IP Data Logger)
Honeywell TE-923
IROX Pro-X
Kestrel 4000 Family of Pocket Weather Meters
LaCrosse WS-2315
Oregon Scientific WMR-100A / WMR-100N
Oregon Scientific WMR-200A
Oregon Scientific WMR-968
Peet Bros. ULTIMETER 100/800/2000/2100
RainWise CC-2000/CC-3000 Interfaces
Tycon TP1080WC
WeatherHawk
WeatherWise Solar Pro