Changing jobs and US job market...

I have been looking for a job for a while now since my current employer was in a dicey situation financially in late November 2007. Just casually started applying in Greater Boston area
for Quality Engineer/ Statistician positions. But unfortunately didn't get any positions that were challenging enough. So started looking across the country...and to my surprise got several interviews from big companies across United States like Infineon Technologies, Intel, Qualcomm, Maxim for Yield Engineer / Statistician positions. I was crisscrossing whole of United States every week from Boston to Northern California to Texas to Virginia to Florida...flying to big companies interviewing and seeing the great country United States is and fascinating, colossal manufacturing facilities of leaders in semiconductor manufacturing. DRAM manufacturing to 3G telecom device manufacturing to highly complicated IC manufacturing.
I fortunately got 4 offers with significant raise in salary. I chose to move to Qualcomm at Silicon Valley as this company is most profitable and stable. Also it is Fortune magazine ranked #8 for best company to work in USA. I will be working there as Yield Analysis Engineer / Statistician.
I wish my move is progressive and I can sustain in that region.