I have a 2340 in 357 SIG, if you can pick one up for 400, I suggest you take it. For what it is, the SIGPros are very nice handguns. One I have is accuracte, the trigger is very SIG like, and the new grip is not as nice as the 226, but it is not bad. make sure you check the grip with the magazine in it(Safty, make sure it is cleared), since bottom of the magazine is part of the grip, you might find the grip uncomfortable with out the magazine in it.
The gun takes apart different then the old SIG, that is a point I did not like, the gun takes apart like a browning, the old SIG take down was much better.
in conclusion(LOL), 400 dollars for a SIG is a very good deal, and getting it in 357SIG will double your choice, since I have seen 40SW barrel for sale for around 140 dollars. I like the SIG, but I have to say my P226 is still my favorite.