$450 for good condition koni/GC is a steal. Since you'd rather buy garbage, can you tell me the name of the guy or his email so I can buy the suspension?
You spend $600+ on Function&Form and I'll spend the $450 on Koni/GC and sell my current setup and break even.
**Edit:
You should buy the Koni/GC setup. Provided he's got pictures that indicate they look like they're lightly used, they should be awesome.You won't get the lifetime warranty, but for less than $800 for a new set you aren't going to find any setup with a warranty worth while. Considering new a new Koni/GC setup is $800, $450 for a lightly used set is really good.