G5 Dual 2.0 Ghz PPC logic board died, ideas?

Dear all,
Hi there, I have seen a few other posts related to this, but figured I would ask for any info on my situation & sad story in these tighter economic times.
I have: Mac G5 Tower, PPC 2.0 Ghz (late 2004)
It has run fine for me since i bought it, not a single issue or problem. Obviously, it is out of warranty & apple care, and in fact, Apple will cease supporting this model in Oct '09.
The computer fails to boot up, brought to Apple Store & was told "logic board AND processor need to be replaced". Cost to replace 764 (logic board) +764 (processor) +135 (labor) = a lot of money for an older machine!
Personally, I did not believe this... i have burned logic boards before, but never a processor. I asked them if i could attempt to just replace the logic board, if that worked, just pay for that... if not, have the part returned (restocking fee only).
In my area, there is an independent mac store, that offered a quote of 570 (logic board)+ 100 labor. This is still a high price for an older machine. The indy shop is still a lot.... my same computer sells on ebay used for roughly the same price as the indy repair.
As I know what is specifically is wrong, has anyone had any experiences buying parts like logic boards online? I see some listed on ebay for like $240.
Does anyone have any advice on how to proceed with this? Certainly, buying the cheap used parts can be dangerous... or not solve the problem, or whatever...
In the present economy, I hope to get a bit more 'life' out of my G5 before replacing it... but really I dont think it is worth paying more than $300ish under the circumstances.
Let me know if anyone has any advice, etc

Sudden Logic Board Failure(LBF Syndrome) is a pandemic everywhere you read the boards. The G5 processors or logic boards or power supplies were really terrible on these machines.
If you want to escalate, you have to DEMAND that you speak to a higher tech manager. Apparently, they will pay for it all if you raise Cain. I'm a fan of Mac products, and my g4 laptop 17" is the best darn thing I ever bought I think.
-Software upgrades with Power management fixes nuked my g5 the first round
-Everytime I unplugged the machine and took it to the AppleStore the PMU reset and the machine behaved better
-I took it in 3 times, they could not diagnose the issue
-After a week, the machine would never boot without the option key
-After living with the option key, the machine would have spontaneous shutdowns
-I cleaned the interior, and that was OK for a month or 2.
-The machine would have kernal panics after that
-then the UNIX code would spew on screen
-then it wouldn't boot at all, even with OS CDs
-Gray apple only-then fans of glory would kick in.
So, what happened? I can only guess since Genius Bar didn't help me is:
-g5 chips ran so hot and energy management ate the Power Manager(they went to Intel because Power PC g5 would have set laptops on fire)
-Constant shutdowns thanks to Power Manager fragged the PMU. The UPS I bought helped for 6 months...sort of.
-The above ate the LOGIC board(bad PMUs do BAD things to Boards and RAM)
-Once the power manager starts getting irregular, the machine kernal panics because of cooling issues or RAM panics and eventually everything corrupts and the poor voltage management destroys the machine.
Mac techs blamed my house voltage, but the electrician tested it and it was fine. The PMU is supposed to smooth amps and volt spikes but it did such a bad job I suspect it shorted or blasted major components.
I'm getting a new Imac which has it's own problems-I don't think the g5 is worth saving but Apple should give a rebate or refund prorated for the years it was used. It's a very bad representative of Apple products and they should be ashamed that they hid or submerged the issue. I think so many software updates dealt with Power management(ie:energy saving) because Logic boards were blowing sky high exponentially.

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