well I also have the 8200cdq. One big difference is the cd drive is a slot drive on the 8300cdq? Some people had complained the draw drive could be fussy in the 8200cdq. I seem to remember review comparisons said some like the 8300cdq was more refined and detailed in some respects but lost some degree of urgency & therefore less fun
One thing I dont like about the 8200cdq, if you have ever looked inside at the right hand front there is a bank of large capacitors less than 1mm away from a bank of heatsinks - that dissiapte their heat onto the the nearest capacitors. I would like to see that board arrangement changed.