amp selection for multi ch AND bi-amp capablity

OK, here goes... I'll try to be brief.
I would like to have higher power for BOTH HT and strictly 2 ch + sub config. I have a 5.1 55 w/ch Onkyo AVR w/no pre-outs except for the LFE. I have a DVD/CD multi disc player w/5.1 analog outputs (has built in surround processing and volume control). Sub is self powered 150W Velodyne line and speaker level input switchable.

I am looking for used economical (~ $100-150) 4 or 6 ch amplifier (3-5 bridgeable) that will: 1) help to breathe some real life in to a pair of older paradigm floorstanders 9semk3 200W in bi-amp config. 2) possibly also have dual functionality of high power for Home theater DTS/DD 5.1 mode.

Thinking I can possibly share the 5.1 analog outs from DVD to the amp AND the AVR (via splitting) Any danger in this?? OR-if not, route discretely the 2 channel line analog outs from DVD + LFE (or center) out straight to new(er) amp which will then provide dual matched amps for bi-amping source and sub (or center) from DVD to remaining (potentially) bridged input for sub (or non-bridged center). I am fairly sure that this will not give me the 5.1 "surround" signal though-unless I use the Onkyo amp via digital out for the 5.1 audio format.

A used Adcom 2535L offered 3-4 channel arrangement that I could bridge for the 3 channel scenario unfortunately the power is limited to 60W into 8 ohm and 90W into 4 ohm + 200W for bridged. This is not quite the power I was hoping for (not that much more than the onkyo-BUT does provide for bi-amping) at the expense of complexity and limited selectivity between 5.1 and 3 ch. configs.

Another consideration is an older Philips 6 channel (3-5 bridgeable). Although this had a short production life-the supposed 100W X6 configuration I thought MAY work for upping power on the center out too while keeping the sub self powered. Unfortunately I can't seem to get detailed spec.'s on and I believe it is limited to a 3 channel input-so although it is "6 channel output" separate discrete surround channels would not be available.

I saw an older Yamaha DSP 2070 but can't get details on input config. other than no digital input cababilty-and strangely that some modification would be req'd for 5.1 configuration (which would be strictly analog). I am confused as to whether-at the time external processors were the rage so there is still a need to separate signals thru mod. for discrete 5.1 arrangement.

Regardless although I have read innumerable posts in forums and technical explanations on crossovers with regards to bi-amping; I still am at a loss to understand how much performance this will provide by just hooking up to separate posts on speaker (without bypassing internal x-over). I read Elliot's guide and I assume the diagram used for bi-amping indicates INTERNAL speaker x-overs and that no external x-over or bypassing is required for basic hook-up correct? The Paradigm manual makes no reference to being able nor necessary to bypass internal circuitry for bi-amping so just removing the copper bridges and supplying discrete signal souces to each pair of inputs are all that is necessary for "basic" bi-amplification I assume-correct?

Any thoughts or recommendations (besides going separates and dumping the AVR) would be greatly appreciated.

I know...I want it all (for nothing!) but just wanted to get some insight and maybe a sanity check on my hopes and expectations or some feedback from some more "creative / experimentive" (read: cheap) thinking types!

Thanks,

"Just gettin started"