I use www.pivotalweather.com for point soundings from time to time. Geared more towards severe weather IMO, though.
If you are dedicated and don't mind a small learning curve, BUFKIT is fantastic for viewing model sounds from the NAM/GFS.
http://www.wdtb.noaa.gov/tools/BUFKIT/
Once you download the program the data distribution is here: http://www.meteo.psu.edu/bufkit/CONUS_NAM_00.html