which speaker to buy

Harsh, but quite a reasonable piece of advice @twoch. We call them helicopter parents and I do not like the way they don't raise their kids.

If your son listens at louder than 95 dB SPL he will have no hearing to listen with by the time he's 60. Maybe he will be satisfied with that for the years of ear shattering music but in the end he will regret it. Take my word for it as a former very loud listener. No mater how little distortion there is it will ruin his ears.

To the OP. As I mentioned on your " pro's and con's of bridging " thread, your son has 2 different Mc amps, and bridging them for use as a stereo pair, will not give him a matched system. Sonic differences between the 7300 and 2002 exist. Also, as his father, you should talk him out of blowing up and destroying his hearing. I listen loud, but always use caution, and to get to " live amplified " levels in a typical living room, is not easy, nor wise.

Don't bridge and purchase a pair of Klipsch Cornwalls done!  These speakers are made for rock & roll and are so efficient that he will go deff long before he can over drive them.  They come with a 10yr guarantee.