I have the Kel-Tec PF-9 also, and though it is a handful, you'd hardly notice the recoil at the point of a SHTF situation. But for a thin and easy to carry 9mm, it certainly qualifies. And it is less than $300.
There is another alternative for a thin 9mm. The HK P7 line. They are expensive, but high quality, safe, and reliable. The P-cocker design is the safest way to carry locked and loaded, bar none. The price is from around $600 for a PSP, to as high as $2300 or more for some of the P7M8s and P7M13s.
I just bought one of the PSP models. They are a marvel of engineering, but a little on the heavy side when compared to the KT PF-9.