That's why I wrote what I did earlier about my experience with the ported Outlaws I have. Not interested in selling you on them, Grant.
Just sharing that even in extended mode, these subs perform very well. (Also, I do not have any experience with REL, nor have I found any bench-testing of that sub... which disappoints.) regardless, ported subs can easily be great performers across the spectrum, for HT and Music. Likewise, you will get better output for HT in your open room with ported. I think I suggested earlier that you would need to deploy a squad of sealed subs to really experience the benefit assuming your open area exceeds ~3000'3. That's not necessarily a hard-fast number, but it does seem to be where benefits of cabin gain start to break down.
Did you say you live within an hour of Hsu? If you get that REL for an in-home trial... I would get a Ported Hsu VTF3 or VTF15 (whichever interests you the most) and have it in your room for a side by side comparison. You'll need to pick a great spot for the subs, and move them repeatedly... but this is the best way for you to experience them, and their differences.
When it comes to planning on how to set up your subs, Low Frequencies are strange beasts, and though a crude technique, I recommend the
Subwoofer Crawl to identify the best place(s) to put them. It does work well assuming you are not prepared to do in-depth room measurements.
Cheers!