In comparison to Q5, the major benefit for Q3 is that it you will have a lot more choices of amps to choose from. A friend of mine has Q5 and it seems to thrive on lots of power, the more the merrier. Q5 bass definitely will go down deeper. I also agree with JV comments in his CES report that Q5 does sound more neutral and Q3 a bit warmer. However, I have not heard Q3 and Q5 driven by the same amps. With Q5, I probably would forget anything less than 3-400 watts.