Can't answer your question, but, at least when I bought my NexGen ( spring 2009 ), Bare had a spring sale that included the NexGen with your choice of Bare thermal underwear. I got the second warmest thermal they had. It's been a great combo, no regrets. I got the impression that this is a yearly event with Bare, every April or May. You might want to ask your LDS to see if they are having any sales coming up on the new ones.
My only comment on the 2007 suit would be about the neck and wrist seals. I think they might deteriorate ( sp ? ) with time, ( dry out ? ) but maybe somebody smarter than I am might be able to shed some light on this. Might not be an issue, but ask.
I just put a post in the here about replacing the zipper on my NexGen. Be careful how you fold the suit ( don't fold the zipper ) They did replace it with the new plastic zipper. 17 dives on it so far, no issues.