I am just confused here.
You speak of a receiver.
You speak of a pre-amp.
You speak of a power-amp.
And you speak of a simple solution.
AVR
An audio-video receiver has the pre-amp, power-amp, tuner, audio processing, and video processing all in one package.
While some websites call them receivers, the correct term is avr. Receiver should be a term that relates to a stereo(2-channels) receiver.
If there is a desire to add a power-amp to the avr later, be sure to choose an avr with pre-outs.
There is no HDMI connection between a pre-amp and power-amp.
The HDMI connection carries audio/video from the blu-ray, dvd, video game console, and cable/sat box to the avr. Once there, the avr processes the audio and video. Then, an HDMI connection is made to the tv monitor.
You can either connect speakers to the avr, or use a separate amp. If the choice is a separate amp, simple rca connections are made between the two. Speakers are then connected to the amp.
Most here feel bi-amping is pointless, due to the fact you are trying to do it with a single power supply within the avr/amp. I agree with this.
I do feel that bi-amping with separate amps can yield higher fidelity, and there are so many configurations, there would have to be some benefit. To that note, I say just invest in amplification that is up to the task on it's own.