IMac, actually is any mac worth it?  -doesn't i in iMac stand for Internet?

Somewhere after the 10.5.2 updates, things started going south.
I should also include I'm on ATT Yahoo DSL 3/512 with a 2Wire 2701 HGB. Also tested on a Ambit (single line, Natted but not routed) Cable modem (would not acquire DHCP).
using just ethernet, many pages would time out (that is half the graphics would go to question marks) - wireless was slightly better (of course, the router is right next to the iMac).
Since I have active cable as well, Charter - I thought I'd try that route, assuming the 2Wire router is bad & or hostile to Macs - Trying the Ambit would not acquire a DHCP address. I can connect (sporadically) to my Linksys WRT54G (tho it isn't online, just trying to connect to it) - again, wireless on the iMac has usually worked fine - but this gigabit weirdness is buggin me out - no plans to upgrade my gaming and business box to wireless just to talk to the mac.
Local service shop said the network port was bad, and replaced the logic board (along with the DVD Drive that had been failing to mount half the time).
Now if I drop the wireless - (leave ethernet on, MTU 1500) ethernet is still back to the same tricks (gigabit ethernet not negotiating a 100 base connection) - I'm talking about "talking to the routers" - from the ethernet port, down that 3 foot cable (cat5e), to the router. I have timeouts there. This is insane.
What am I missing here? Gigabit ethernet smoothly auto-negotiates from 10/100/1000 on Windows.
Since this just got out of the shop with a certified "stamp of repair approval" I am quite unsure of what to do at this point. (well, I'm becoming more sure, stick with what works!)
Any help appreciated.

that was the route I took this time when I updated to 10.5.6 - the downloaded combo updater rather than the smaller (half the size) Mac updater...
Pretty sure this is a combination of MTU, 2Wire 2701 oddities and me not knowing how to solve them directly (as well as the ipv6 stuff that's still showing in the logs despite IPv6 being turned off).
Anyhow, I did get it connected under the Ambit finally (took restarting the mac, not expecting that in the "switch" from windows xp)- and that really rocked. Now I'm working on teaching my 2Wire to be a dumb modem, to go with the operator
Actually, I think I'll just cut my losses for the moment and go with cable, once I find a good wireless router to connect the media center and xp box up front.

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