Thanks for all the suggestions. I expect our annual Amex expenditures to be under $50k (maybe $30k-$40k initially), and I generally use Starwood for all of my personal spending (because the points are more versatile). I also don't think we'll need a card without a spending limit. Is there a starwood business offer that you would recommend?
With respect to a business Visa/MC, I would be interested in the Citi AA card, but they seem to have removed any information about the bonus offers from their website, so it seems like they many no longer be honoring that offer. Do you know of any other links to that offer (with information about the bonus) or any other similar offers? Otherwise, I guess I would go with one of the recommended Ink cards. (This would really only be used as a backup for when the Amex isn't accepted)
Another question - Since our business is a partnership, do you know if there is any way to split points or miles earned on a business account between 2 partners? Would starwood be the best option, since they are generally more flexibile with transfers?
Thanks a lot for your help.