Best way to reinstall OS X and user acts??

https://discussions.apple.com/message/21962798#21962798
Just in case the discussion forum blocks the above link (its happened before), that discussion is about the problem I've had with my new iMac. I can browse the web for minutes, hours, or days, and without warning the internet performance will lag to a crawl and finally halt. It doesn't matter what browser I use, or whether its a wired or WiFi connection. Download clients freeze just like browsers. My 7 year old MBP runs just fine next to it on the same connection.
The problems I've had with the new iMac have gotten beyond irritating and reached "return it for service". Before I send it in, I need to try one last thing - erasing the OS and reinstalling it. Reading the help files and KB articles I see two options: Internet Restore, and restore from Time Machine. I really don't know what to try. If the Time Machine backup contains the system flaw (if any), then the machine will still have problems and I will have wasted time. On the other hand, if I try Internet Restore and my Time Machine data contains the flaw, it'll return to the machine when I move my data back anyway.
So how do I install a fresh copy of the OS, restore my data, and move forward without bringing along whatever it is that might be causing this machine to creep to a halt during browsing? I need to figure out if this is a system flaw before I bring it to the Apple Store.

Uggh! What a PITA you're facing.
If you know what you are doing, before you go too far down this path, you could try further debugging on your own with the Console log and/or something from one of the host of third-party, software/hardware integrity checking apps. However, it seems you've already gone that far or more with Apple Support.
I must say, my own experience going from 10.6 -> 10.8 with a direct install was also painful. I had left over components that ran mysteriously in the background causing all sorts of issues. I never did a fresh install, rather I spent lots of time tracking down odd things (and nearly crashed my whole system entirely). Then, I did a re-install.
In any case, I suggest, absolutely and positively before you wipe the hard drive and do a fresh install, do a full RAM test and a test of the HD for bad blocks. You can find third party utilities for these tests ... TechTool or the like. Alternatively, have the Apple folks do the full set of hardware tests for you. You don't want to install good software on flakey hardware.
In addition, you might be best to avoid the Apple Migration tool. This later means you have to do app-by-app resets of registration and preferences, hopefully while looking at the equivalent on your MBP.
Perhaps since bad luck comes in three's, this will be the end of it for you.
Good luck ... let us know what happens.

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