Well one thing is for sure, prices sure vary by region. I have yet to see a G4 21 for less than $629 in MI, and you don't see many of them. Used they are rare. I work in the store part time, so I might be able to get it marked down a bit (but they are real sticklers on used pricing). I'm actually gonna have about 50-75 in gift certificates to put toward it too (earned in a promo).
As far as selling the M & P 45 full size, it's a good gun, I shoot it good, I just don't like the way it feels. And that's after some trigger work by Doug from ATEI. They are good guns and no doubt a competitive platform in 45, but I just shoot my Glocks better and they feel better finished to me. Also the aftermarket support is far better for Glocks. Plus the M & P 45 compact is not much smaller so there is no option for using the same platform in my carry gun like the 30S.
As far as the Kimber Pro CDP, it's a GREAT gun, but guns are tools. And to me a Glock 30S makes more sense for the same purpose, easier maintenance, more capacity, lighter, the ability to carry 13 round mags for reloads, and about the same footprint in a holster. And the reality is I can get one Glock a year on an employee deal so selling the Kimber will leave me about $600 richer and I need the money. In an ideal world I'd keep both. But in this economic recovery the money is important without giving up the function. So selling both will net me about 1600 (maybe more) and I'll have less than 900 into the 30S and 21 G4.