Dear thelollys,
I've been writing the below response, without actually answering your question.
No, I have no good references for salary comparisons between Switzerland and the US.
What might be most important to is to understand the cost-of-living differences. A good source for this is the UBS Prices and Earnings Report:
http://www.ubs.com/1/e/wealthmanagem..._earnings.html
Other than that, take a look at some very helpful budget and estimating tax tools:
http://www.ubs.com/1/e/ubs_ch/privat.../toolpage.html
I also suggest, if you haven't already done so, pick up a copy of David Hampshire's book: Living and Woking in Swtizerland . It answered a lot of gnawing questions I had regarding Swiss living.
I wish you the best of luck.
Jay
The rest of my original response is below and deals more about salary in particular...
As you will see from the endless posts on this board, salary is much debated topic.
Even after receiving my offer and hearing from many on this site that it was extremely good, I had co-workers tell me that it was too low. So, it is also very industry and individual company specific.
Talk with your company to see if they think the costs that you have estimated are accurate for Basel and where you might live.
I think Basel has the benefit of closeness to France which Zurich does not have; I have heard from several persons that they do their grocery shopping in France to save money.
Finally, the relocation package the company is offering is equally important. The cost of moving a family from the U.S. can be quite high; I know, I did it five years ago when I moved to Sweden.