He said he can add a second sub down the road to the XS-30 or Rythmik F15HP seems like a no brainer to me. He's leaning toward the PSA at this point so XS-30 looks like a winner. It's a great sub, no doubt. I suppose the argument can be made for 2 XS-15 now and 2 more later though.
OP here's a thread on those JTR's. I think they look very promising, especially if you can run them on fairly standard level AVR (onkyo, denon, etc).http://www.avsforum.com/t/1458711/jtr-noesis-228ht-the-best-speaker-you-never-heard-of-for-1000-pricepoint
That intro price looks to be a steal for what those speakers are. The Noesis I heard were very impressive and Jeff of JTR is a great fella.
On Onkyo 818 vs Denon 4311 it really comes down to the features you want. The 4311 has more amp channels built in and also can go up to 11.2.. I'd never use that, well at least before the next AVR upgrade. It also has Audyssey SubEQHT which does not EQ subs at all. It can independently set distance / phase and can independently set level, I can do better then it does with the gear I have on hand so that is worthless to me. The 818 supports 4k video and has more video processor type features. Folks also tend to like the GUI better although I'd say neither is all that great. The 24p bug is fixed for sure BTW on the 818. The 4311 is a 3year old design at this point.
It is just tradeoffs between the two. The 4311 was certainly AVR king for a long time and is a great AVR, not trying to ding it or start the AVR war here (this has been gone through dozens of times). If I missed a couple differences feel free to add to my list.
I'm really not seeing why you are so set on those EMP speakers. I really think you should prioritize on the sound quality of the front three speakers now and work on the other upgrades later. My system has been on an ever evolving upgrade path since day1 about 20 years ago. I'm very pleased with where I am at but have several things on my wish list. My front 3 are nice, my subs are nice, XT32, plenty of power for my listening...surrounds blow and no acoustic treatments. I could use a better measuring mic then my RS meter as well.