Thanks to all suggestions.  I found a good app note on the Xilinx site for
Board Routability Guidelines for Fine Pitch BGA Packages which is very
helpful.
As I expected, I got a few direct solicitations from board fab places,
mostly US, but no good testimonials of good experienced Canadian fab houses.
I really do not want to go across the border at this time as we currently do
not use any fab places outside the country, and it adds a whole other level
of complexity to shipping as well as possible delays especially with
heightened security these days.
Regards,
Genny.

To open another can of worms, most datasheets or app notes have said 'use
NiAu or OSP finishes'.  We have 99.99% of the time so far used HASL (no
BGA's), have been made very wary of NiAu and have never tried OSP.  We have
tentatively approved immersion Tin as an alternate finish in select cases
but have not used it, and I'm hearing a lot about immersion Ag these days.
Survey:  What do you use for your BGA board finish?

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