I've heard of quite a few people who went for an 805 due to that same article and regret doing so.
Here are a few reasons why:
90nm + Netburst + Dual Core + Overclocking = shitloads of heat, so you'll need very good cooling to tame it.
Even a 4GHz Smithfield is pretty well matched to a 2.4GHz X2, which requires significantly less effort to achieve.
Powerdraw is insane, so you'll need a good quality motherboard, powersupply and very good case cooling.
Personally, I'd wait for X2s to drop in price next month if you want to build a system to overclock. A 160 buck X2 3800+ is very likely a much better deal than the 805... and there's always Conroe.