It should work out well. If you need any Capacitors for your smaller speakers. Here is where to get them. Just remember if you wire anything down to 2 ohms you will cut twice the frequency that the speaker sees from the 4 ohm rating. I am wiring the 4" speakers in Parallel with the 6.5's so all 4 of those speakers will see 2 Ohms and that in turn will double the power output of those channels also. The amp has an adjustable output to control how loud they get so they don't totally out power the back. The pre amp eq also has a Master Volume Control and a Fader for front to rear, so this should help too.
The amplifier I got has Active Crossover adjustment for both the front and rear channels. The 6x9's will get full range and the 6.5" 3 ways I will set the amp to start at around 200 Hz and up. The 4" little guys I am cutting everything from 600 Hz and down out of the equation using the Capacitors wired into the + side of the 4" speakers. Again this is a very simple install and VERY inexpensive.