Argh, I hate you for showing me this thread. That new signature looks good enough to actually make me reply. >.>;
So yeah, I'd say you should switch. Both of 'em look nice, but I personally like the "contrasting" colors of the new one better. The red and blue-ish colors add a nice touch, as does the purple on the left. The effects on those people in there make them fit in a lot better, compared to your old sig.
I should also say something witty about the background effect, but I'm bored right now. It looks good. >.>;
*stabs Ryoko*