After reading some more extensive discussions on the subject, here's what I've concluded so far and I hope they're accurate.
The need for pure sine wave UPS when using PFC PSU
1. If you can afford it, get it and stay with your PFC PSU. PFC PSUs apparently require less load from your UPS.
2. If you're on a 120VAC line, you're fine with a non pure sine wave UPS.
3. If you're on a 240VAC line like I am, unfortunately, non-pure sine wave UPSs are not good if used frequently or for long periods but even then, it's not exactly a death sentence for your PSU but it is a sensible warning to consider. This pertains to the battery use of course. These sine wave thingies apparently kick in when your UPS gets no power and starts running on battery.
Seeing as I don't get that much power outages in my area and I just need it to give me time to shutdown my PC properly and probably save some open files, I think I'll be fine with a non pure UPS. Also seeing that there's no widespread panic over this, somehow I feel like I've known all along. That I'd be fine that is. It's the need to know for sure that often overwhelms me. Ignorance is bliss indeed.