It looks like I can get about $25-$30 for the 4800+ on ebay. That'd make the 5800+ about half the price.
I can just use my heatsink/fan from my 4800+, so it being an OEM is okay.
If I were you I would get this. Same cache as the 6000+ and 6400+ but runs a bit slower at 2.8. with less watts and it is a Windsor.
Why would you recommend a slower, older, hotter processor that's more expensive?