My iMac sorrows... #1, #2, #3, #4 and now maybe #5

Question

Well, for those who have read my other posts regarding my horrific experiences of iMac terror, I do truly hope this is the last.
iMac #1: 24" Aluminum iMac 2.4Ghz had original and common freezing problem, was replaced on day #88 after 11 days of sitting in AppleCare where replacing the logic board did not resolve the issue. (Bad timing, 2 days later the patch came out that fixed it)
iMac #2: They replaced my first iMac with a 2.8Ghz at my request and with my credit card for the difference. Unfortunately, I was back in the Apple Store the next morning because the backlight within the screen was bleeding bright light whenever the screen was black (screen savers, front row, image editing).
iMac #3: The second iMac was replaced without hesitation and I confirmed everything was functioning fine and operating well before I left the store. I gave it a full run through. Was very happy.
iMac #4: Yesterday, I returned to the Apple Store with my broken iMac in it's poor little box because after 3 weeks of use the hard drive fan was apparently going out and sounded like a playing card in bicycle spokes. Horrible, but what am I suppose to do. They offered to repair, but didn't have the part in stock so they replaced it AGAIN.
At this point I am really losing my sense of humor and tolerance here, if you can imagine.
NOW: You'd think that iMac #4 is the end... Well not necessarily. I am heading in to the Apple Store in a little less than 3 hours to bring in iMac #4 because the right internal speaker is blown (or at least sounds this way) and you cannot bring the volume up past 1/2 way or all sound from the right speaker is garbled.
Apple Care this morning confirmed that it is in-fact a bad speaker and it will need to be repaired, or in my case replaced.
I am not happy with what has happened, although I can see that reality suggests I have extremely bad luck or the rest of this planets iMac owners have bad eye sight and bad hearing. I know there are working iMac's out there. I just can't find one.
I really don't think I am being picky at the least. I haven't had an iMac that is working as intended for 110 days. Just simply rough.
Anyway, I am going to shut this audible distortion mechanism down and box it up and hopefully I can get a solution real quick as I haven't slept at all while reloading, troubleshooting, AppleCar'ing, etc.
-- Oh, and my aversion to repairing and preference for replacements stems from them damaging the case of the first Aluminum iMac on 3 corners when I took it in the very first time. I don't want a Brand New "Repaired" iMac...

Answer 1

Update:
I walked in within just hours of the posts below, asked for the local Apple Store manager and explained the entire scenario. She was already aware of me as exchanges apparently require her signature.
She was absolutely wonderful, apologetic and empathetic to my situation as a small business owner and having such a bad run with these iMac's.
She didn't even want to check the iMac I brought in, she simply had it replaced, my memory swapped and allowed me to sit for 20 to 30 minutes checking everything to make sure it was good to go.
They even reassured me once again, that if this in fact happen to be bad as well, they would replace it again.
For my troubles (not necessary at all), they also offered me a nice price break on anything Apple the next time I come in.
Thanks Apple, and note this machine is running perfectly.