What speaker could safely be ordered without hearing it first?

Maybe and it is very straight forward.  Speakers are going to sound good or bad based on the room you are in and the equipment you have paired with it.  If you have no equipment and will build the system speakers first, any speaker can be ordered as it will be matched after.

if you have existing gear, the answer is a vehement no without knowing what gear you have. Then, maybe but you need to work with someone you know.  Joseph audio is neutral.  System match can be easy but I can show you horrible gear to match with it.  Borreson is relatively bright, especially compared to Raidho.  Horrible with certain gear. 
 

This topic is kinda like target shooting w/a blindfold on. But here goes nothing. I see 2 generic possibilities:

1 - If speakers are to be located near the back wall: go for high quality sealed/acoustic suspension design. Easy pick of those: pretty much any of the ATCs. Even a stand mounted 2-way gives killer sound with great dynamics

2 - If speakers are located anywhere you want in the room, just go for high quality, period. Easy pick there would be a Harbeth 30.2 or 40.2. These need stand mounting but really don’t require subwoofer augmentation unless you want the absolute best deep bass.

(that’s my 2 cents)

@mtbiker29   This has happened to many of us.

When one with no experience admires a high performance something and reads a litany of positive accolades by users, not knowing they too are mostly first time fan boy users with little or no experience, who've found by providing a positive review somehow lessens their poor decision remorse.

A product sitting between your speakers is exactly that something.

People are taking the time to offer you overwhelming advise that, what your calling a frivolity, should to be avoided. 

Now that you got a ton of different recommendations, I hope this has made your search easier.  Here is the best advice, Narrow your search down to a few choice "Efficient" speakers. The key word is efficient because they more likely to reveal all the suttle details and don't require a ton of expensive power.

WAF.

Remember you will be looking at them a lot more than

listening to them.