You also have the option to get the 8200A now and add the 8200P later.
You can use the 8200A to drive the tweeters and the 8200P to drive the woofer.
The 8200A and 8200P will provide the same gain (even though their rated power output are different).
You can also use the 8200A to connect to 2 sets of stereo power amps (eg 8200P) or 4 sets of monobloc (eg 8200M or 8200MB) actually since it has 2 sets of pre amp outputs.
Unless your source is the 8200CDQ which has a pre amp output, then skip the 8200A or 8000Q/8200Q and just go for the stereo power amp option to go with the 8200CDQ.