Need help deciding on Rotel Amp for 5.2 sys

Our home theater was created on a single income Family budget. When it's my turn for a good action packed LOUD movie, there seems to be a lack of power for me. Listed below is my set up. The amplifier I am going to purchase will be the last good effort before retirement next year. Fixed income will not allow the goodies. Thank you.

Room size: 11 ft wide(Monitor) x 25 long (seats)
Integra 50.3 7.2 bi-amped front
B&W Speakers 684 Towers (bi-amp) Front L/R
CM60 Center
8 in. ceiling
Klisch Sub Two 10 in. power subs

Should I buy a 3 channel for the front and use 130 watts on two rear ceiling speakers?

Buy 5 channel 200 watt and only use the Integra for the pre amp?

Would like to buy a pre owned upper end unit.

Thank you