Hi DJ,
I would have thought 140wpc from a power amp was enough to drive any of the speakers listed without an issue. The only way to answer the question on the subwoofer is by listening to the alternatives - a lot comes down to personal preference.
Having tried a sub-woofer in my system I decided against it, mainly for two reasons - I thought it didn't add much to my system (decent floorstanders) and if I cranked it up, the kids could not sleep upstairs.
Spending the kind of money you are talking about gives you the right to expect a decent improvement!
I've been using my speakers for over 15 years, but have always been more than happy with the results. The reason I remain happy is that I spent a considerable amount of time demo-ing alternatives before purchase. I brought alternatives home, lugged my old speakers to the dealer for side-by-side comparisons, etc. I am shocked by the number of people on this website who appear to buy things "blind". Don't do it, most particularly for speaker systems.
Happy listening!