First, these are all good trades for you. It'll probably come down to which one the other guys would go for. And also your own personal opinion for how you want to shape your team: ie, upgrade at 2B, SS, OF, and/or 1B? sacrifice a little power for speed? which guys do you like to keep pace, pick up the pace, or fall off pace?
Of these new trades, I really like A - it's an improved version of your original #3. Morneau > Dunn and Bay is good return for Bills (who will help your lineup greatly, especially with Sizemore on the shelf).
Value is good for the new B and 3 (why do you have to make things difficult and list them as A, B, and 3?
). But I don't like giving up Lee, who is arguably your best hitter.