Speed, price, quality, pick any two (or pay thru the nose)
I think you are an enthusiast. Furthermore, I think that a mainboard is possibly the most important decision when building a box. The mainboard is the computer...
For future proofing on an AMD box, I would strongly suggest you go with the nVidia 680a chipset. It currently has the most PCIe lanes of any single core logic chipset available at any cost, at 56 lanes.
Unfortunately, there is only one currently available mainboard sporting that chipset- the Asus L1N64-SLI WS. No firewire tho... Its a socket F mainboard, meaning 1207 pins, which is where AMD architecture is headed. With an AMD processor, the memory controller is on-die, why they dont have a front side bus architecture. When you throw four cores into this mix, for technical reasons they had to increase the pin count to be able to perform like an intel quad. Socket AM2 is on the way out, as I understand it.
This board has two sockets, as do all socket F arrangements. It's really a server arrangement, you wanna know the truth. The chips that fit it are sold in pairs, with the fastest ones pricing at $999 last time I checked. FX-70, FX-72 one or two more, I believe...
If you build on this board, be prepared for a power hungry monster. AMD is far behind intel in terms of performance per watt, so be prepared for a box that will make your neighbors lights flicker when you boot games. With a modern SLI setup, I would use a thousand watt power supply.
If Im not mistaken, there will be chips with the barcelona core for this board, so you maybe have some reprieve coming in late Q3 or early Q4... but I am not going to lie to you. This board did not review well, and there hasn't been much interest from nVidia board partners in this chipset, even tho it's downright awesome. It's not that the board sucks, per say- it's that a core 2 duo will stomp holes in it. There isnt an AMD offering that can compete, currently, and since this is a board pointed squarely at the enthusiast market segment, naturally they are gonna slam it. Enthusiasts are a very fickle bunch, and we seem to all want core 2 duos or core quads, at least for now. While we are in fact a very small market segment, other market segments are in some cases heavily influenced by our opinions, so AMD posted a 611 million dollar loss last quarter. Barcelona had better be good, very very good, or this fight between these two companies is going back to K6 days, in terms of market share.
Dark days for AMD... Rather a shame, because they did pull off the impossible seven quarters in a row by holding the CPU performance crown. They'll be back tho, I think.
Have you considered a Core 2 Duo? I know, I know, it just feels like selling out, but from a purely value point of view, thats the wisest choice for the consumer, at least for now and the near future. Whether or not barcelona can change that remains to be seen... There are a lot of really good technical people on both sides of that question. Time will tell.
Especially when you consider cost of ownership. If you are a serious wirehead, that thing is gonna break the electric bill.
Lemme know how it works out.