I find the Sig Pro's to be very slightly on the warm side of neutral, which I actually prefer. They are fast and detailed with luscious bass that isn't bloated or lacking. The sound gets better with amplification and acceptably awesome without. These are a truly portable design where form follows function in productive harmony. Obviously each headphone has it's strengths and advantages giving it a place in your collection. The Sig Pro however is a great all rounder, probably the most versatile headphone I've listened to and definitely one i'll be keeping for a while. If I could take one headphone this would be it.
I completely agree and Congrats !