The US has already gotten the S5 Mini with a couple of smaller carriers. Right now, you can purchase the Samsung Galaxy S5 Mini G800H from Amazon for around $350. This would be the ONLY S5 Mini variant that I'd suggest since it doesn't use Samsung's Exynos processor (it uses a Qualcom Snapdragon 400), which means there's a better chance that developers around the web may be able to provide ways to keep the phone up to date with the latest version of Android, even if Samsung is no longer supporting the device.
Seeing as your post is nearly 2 months old, let me know what you may have ended up getting, or if you were waiting for a response like the one I've provided.