Best speakers for $3000

It sounds like the OP wants what sounds best at $3000 for others, then he'll decide among this short list developed using whatever factors he decides to use.

Trrevell, I have found that bang for buck is best with either used, or internet direct companies like your emotiva amp.  An internet direct speaker company that floored me with its Sierra 2 model was Ascend Acoustics.  This speaker simply does everything right with no weaknesses.  The detail, accuracy and air is just splendid.  The highs, with the Raal Ribbon tweeter, are never harsh but so real and detailed.

For you, I'd suggest looking into the floorstander model, the Sierra Tower, with the Raal Ribbon option.  A 7 year warranty, 30 day in home trial, for 2800.  Not sure about shipping though.  

Aerial 7b, 8, 8B, or 10T all do a good job at what you want, and at current used prices are enough below your budget to get a better amp also

Melb, gives a nice mix for you to start with.  You have speakers that are all voiced a bit differently so depending on your tastes, you'll fine at least a few that you will like.

A factor you may want to consider in narrowing down the many possibilities that have been suggested is that I suspect the sonics of your amplifier are likely to be significantly better driving a speaker having a nominal impedance of 8 ohms (or more), compared to driving a nominally 4 ohm speaker.

The main reasons I say that are (a)the amp’s 4 ohm power rating is only 60% higher than its 8 ohm rating (240 watts vs. 150 watts), rather than the ideal which would be a doubling or close to it, and (b)its weight (which is often a useful indicator of power supply robustness) is only 31 pounds (light for a class AB two channel amplifier having such high power ratings).

Good luck. Regards,
-- Al