I have a 10 year old Sig P220 with crimson trace grips and I'm considering trading it in on a new Glock 30 gen 4. I am looking for opinions on this. If I do make a trade like this how much should I be getting for the Sig and how much should I be paying for a new Glock. The Glock is a new out of the box no upgrades. The Sig has had probably 1200-1500 rds fired.