i have the BX8a's and i will tell you that you wont be unsatisfied. they are excellent and the best thing about them is that they really make everything you hear sound naked. they are so flat you can hear every element of a song seperated and exactly where they are in the stereo field. they represent the most true form of sound i have heard.
there are other great things about them,
1. they are magneticly shielded, which is something you need if you have alot of equipment or computer monitors around so that the magnets in the monitors dont skrew shit up.
2. they are bi amplified and also have their own gain knobs per monitor, so you dont need a pre amp.
3 they can except both trs and xlr inputs!
basicly my friend, for 500$ you need to be getting these. they sound great and are extremely helpful