Of the speakers I mentioned I’ve only heard the Ushers, and if you’re looking for musicality and excellent imaging and 3D soundstage they are excellent and a huge value for the build quality and performance on offer (and also great looking if that matters), but the others all are also very highly regarded. If it’s me I’d definitely go for the Revivals or Ushers as they both have great pedigrees, and I’m highly confident they’d deliver excellent 2-channel performance that won’t disappoint on any level.
Incidentally it appears the Ascend ELX is well above your price target so the Sierra Tower may be more appropriate. Not sure I’d worry too much about efficiency as any 100Wpc amp with a decent power supply should be able to easily drive any of these speakers. As an aside, not sure what you’re planning but you should be looking at a good stereo integrated or separates for 2-channel duties that you can incorporate seamlessly into your HT setup if you’re at all serious about stereo performance.