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I'll jump in. If you are looking for an HK (since that's what you mentioned) that is what I'll comment on. I have an HK P30, and was at an HK day at my local gun range over the weekend.

If you want a hammer fired weapon, the P30SK is attractive. But, be ready to pinch yourself changing magazines. I also have an XDm .45 where this happens. A P30SK is easier to conceal without an extended mag, but I don't care to to have my pinkie dangling on a double stack gun like that. Personally, I'll stick with my P30 over a P30SK.

If you'd prefer striker fired, take a good look at the HK VP9. It's basically a striker fired version of the P30. The P30, P30SK and VP9 all share the same magazine.

Getting away from HK, I carry my P30 when I can, and use my Sig P938 as a backup gun or a primary carry when the smaller gun is preferable. For a secondary gun, I prefer a single stack because it's easier to use in a pocket, IWB, etc so has a lot of versatility. I prefer the P30 double stack for ammo capacity. But that's just me. I'll also say that my P938 is more snappy than my wife's XDs 9mm (since that one was mentioned also). To me the XDs is a joy to shoot and would be a great single stack alternative in a striker fired format.