So I was trying to decide on a .40 handgun a while ago. I had a poll on here about it. In the meantime, I bought a RIA .45 at a gun show. Good shooting gun and I really like the 1911. Here's the dilemma: I got a call from a buddy that has a buddy that needed some money for Christmas. My buddy is not into guns but his buddy wanted to sell one to put some presents under the tree. So I give the guy $400 for an unfired new in box S&W M&P .40 w/3 boxes of ammo. Just like it came from the gun shop. Now after shooting the .45 I realize I don't really need the .40 and would rather have a 9mm for the ammo cost. I mentioned to a co-worker that I might be getting rid of this gun. He has a Sigma .40 and wanted to see if I would trade with him for his gun plus cash. His Sigma is worth about $250-275 trade in to my dealer. He would make up the rest in cash. I was all set to do this but now I think that I've already got the gun paid for. If I trade with my co-worker and then go trade with my dealer, I'm just going to end up spending even more money. I like the feel of the S&W and if it weren't for the RIA, I would probably just keep it. What would you all do? Keep a great deal on the S&W and invest in ammo or make the trades to help out a co-worker and get into a 9mm?