Personally, I'd spend the money on the 2 channel amp rather than a 5 channel plus all the extra cables. Bi-amping with a pioneer as the pre doesn't make any sense to me.
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Thank you for your response, Meiwan.
I configured pioneer bi-amped, and pre-outs will send high freq over L&R, and low freq over Surround L&R. So, I can have multi-chan Rotel to allocate 120w+120w to each speakers.
I just dont know 100W Threshold with standard connection or Rotel with more power allocated will sound better.
I'm not familiar with either of these amps but have toyed with passive biamping as you're contemplating quite a bit. It rarely provides improvement.
You should go with the better amp (channel for channel), which I assume is the Threshold. It's very unlikely you will realize any material "power" benefits, and I've never had a multichannel amp that sounded better than a 2 channel.