Crazy I see this thread. I just purchased a CyberPower UPS from Amazon about 45 minutes ago. I chose the
because it provides closer to a true sine wave waveform than some of the cheaper ones do (cheaper power supplies have a modified square wave).
The reason a true sine wave is important is because if you use some of the nicer PSUs these days that come with Active Power Factor Correction (your Seasonic and my Seasonic both have this feature), a cheaper UPS' modified square wave can at the worst mess your computer up and at the least not stay powered on in case of a power outage.
If you do end up getting a UPS, I'd recommend you get one with a true sine wave or one that can handle Power Factor Correction enabled PSUs.
Hope this was helpful!