I use the Next Music this was made for the Next Launcher (home replacement), it has a good EQ 5 freq adjust from 60-14K and its free. The graphics it uses to simulate playing music is a digital record player.
PowerAmp is my favorite and then PlayerPro. They are both great. Have used the Next Music widget and it is ok, but not as good as either of the afore mentioned. Plus, you have to have the $15 Next Launcher (yes, I have it and still not sure it's worth the cost).