There are a lot of good places to soar in the USA. However, when all is considered, it's hard to beat what SoaringNV at Minden, Nevada has to offer. Modern fleet, including a couple of Duo Discus, newer ASK-21, LS-4 and more. Occasionally the staff is absolutely superb (I only tow for them part time :c). Awesome scenery and romping summertime thermals and cloudstreets.
Have a look at
http://www.soaringnv.com/
But also do a search on soaringnv and read some of the reviews. Turns out when you work hard to make customers happy . . . you get good feedback!
bumper