Tube Integrated - Narrowed down to 4 - Help pls

Hi gang,

Ok, speakers are a custom-made, Great Plains Audio (Altec) 604 based system, with BSC filtering that leaves the sensitivity at around 96bB-97dB....

I'm moving from a Parasound A-21/Sonic Frontiers SFL-1 combination, to a tube integrated....All of my prior speakers were hideously inefficient, hence the big power SS amp...

Here's my list of finalists:

Rogue Tempest
Rogue Cronus
Cary SLI80
Cary CAD300SEI

The 300SEI is the odd man of the bunch of course, but I'm still on the fence about going SET or not....I do want the "magic," but my listening preferences (live volumes at times) and living space (15 x 30) are concerns....If SET is the only way to go, then I can rearrange the room for more of a near-field listening environment (6' from the speakers). Regardless, SET is still a consideration if folks feel it'll work....

I'm looking for as much of the midrange sweetness of an SET that I can get, and I'm also a sucker for soundstaging, imaging and super high levels of detail....Add to that, I like dynamics and a good, solid foundation....I may be off base, but unless I spend a fortune on a 300B amp with massive iron, I don't think I'll get the "punch" in the low end that I like...I have zero experience with tubes, so I could be all wet...All I know, is that when a bass pedal hits a bass drum, I want it accurate, and not like a pillow...

I know there's 10,000 other options, but I've narrowed it down to these 4, so if you'd be kind enough to limit your input to the above mentioned products, I would greatly appreciate it....

So the million dollar question: Which one, and why?

Thanks so much for any input!!! I have zero options in my area when it comes to tube equipment, so I'm flying blind....