Best all around speakers

I prefer the strategy of matching amp to speakers rather than going least common denominator, but if you must have speakers that will match to the widest variety of amps, I'd say horns (high efficiency) or something efficient and with > 8 ohm impedance (not very common) for improved damping factor with most amps. I think Harbeths mentioned may fall into this category, but not sure. Rogers I'm pretty sure does.

If you match the amp properly using something that is high current and doubles output from 8 to 4 ohms, like many Class D amps or some Musical Fidelity's I'm familiar with for example, I'd say Ohm Walsh series 3 is the best moderate cost floor standing full range I've heard. Depending on room size they range from $1000-$6000.

If the sky is the limit regarding budget, then you have many fine choices if you match components carefully depending on taste and preference. Good monitors with limited low end will cost less, good full range floor standers will cost a lot more.

I'll give a plug for SP Technology speakers. Good enough that you could even do mastering work on them. It's all going to be about waveguide technology before too long.

Either speakers are accurate or they're not.

The picture is rather less black and white than you paint. I suspect most audiophiles will agree that speakers vary by degrees with none being "accurate" when compared to most electronics.

I've never understood trying to match speakers to particular types of music

I assure you it works. Quad ESL's at low SPL's with soft acoustic music can be sublime...but they won't play rock very well. Some audiophiles have several systems that are suited to various genres. In theory, this may be the "best" option - multiple systems with each designed around a particular genre...

"Some audiophiles have several systems that are suited to various genres."

Shadorne, this is certainly a viable approach and perhaps even the best option to produce multiple optimized listening experiences as needed or desired, but don't you think the very top echelon large full range speakers with proper amplification and quality electronics can play all types extremely well, especially if they can handle large scale orchestral works with minimal compromise?

I understand the limitations of the Quads in particular, but there are other large speaker designs out there that cost a lot more that should be able to handle everything extremely well including the things the Quads excel at, don't you think?

Agree with Shadorne, Dunlavy (and Duntech's Classic series) are speakers that are very good on all genres of music that I heard on them. And from their measurements it appears that they were designed with accuracy in mind, so that might have something to do with it.