i have plenty of experience with panasonic HU I have the c8300u. the model you want does 3 preamps front, rear, subs, and 1 auxilary input 7 band eq, and a built in crossover. My opinion its a good HU. Especially if you might want to upgrade your system in the future.
yea, i have the C8400U, which is the same as 8300 except the 8400 is 60x4 max instead of 50x4 and some other small (but could be important to some people) differences...