The best advice I can give is to go and listen to the monitors at a store. It's not perfect, but it'll give you a lot more useful information than spec sheets. Take music you know well and A/B/C/etc. all the monitors on your shortlist.
I've been surprised a few times when monitors that look good on paper turned out to be bested by significantly cheaper units.
If you are going to do a listening check, be sure to see how they're hooked up in the store. You may get a shock if the mixer they're running through has the low frequencies boosted and when you get home you discover the sound isn't as 'powerful' as you'd first thought. Also note what inputs they have and how that will gel with your interfaces.
All of this, of course, depends on where you live relative to dealerships. If you're miles away it may not be possible to get into a decent dealership. On the other hand, monitors are the sort of things that you'll have for years so perhaps it is worth going that extra mile to have a listen.