YIPPEE!!! News from Natalie!! I knew everything was on track 
I think 'Scars' is quite a good choice & is more the type of song people who don't closely follow Natalie would expect. Having finally heard the 'upbeat' version that everyone's raved about, I have to say I like them both the same. The older version fits in more with the 'Glorious Era' and showcases Natalie's vocals & while I do indeed like the melody, considering the lyrics, for me they don't quite fit. I think the acoustic version is more appropriate for the lyrics, but the album version seems a bit too light musically.
Using a different version for the single release may have the advantage of making people buy it, because it's different to what they have on the album, but what I really would like is atleast 2 b-sides 
I really hope 2010 is Natalie's year.