which connotation gives to a phrase ending with "na" instead of "ne"? is it more informal or what?
"soo da naa" instead of "so desu ne"
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「ね」 seem to be more rough sound and generally applies to the male gender but is not necessarily restricted to only males. You can think of it as "huh". e.g.
Yousuke: You are going to the library now huh?
Bob: I studied Japanese a lot, right? But, I still don't get it at all.
In your case,
「そうですね」 would roughly mean "Is that so, huh?"