I wouldn't think you'd have to settle for a new motherboard in a year, the Lanparty seems more than supplementary for a while plus with socket 939 you can just pop in a new processor without having to upgrade to socket M2 and DDR2.
The only reason I'd upgrade might be for Socket S1 and these Turion mobiles, and that'd just be a fall back system most likely as I'd like to snag an FX processor cheap and pop it in the lanparty. I'm only moving to PCI-E now so that I have it out of the way.
I preordered my 3200+ a couple weeks ago and ncix still doesn't have them in so I have no idea how long I have to wait for them now, I'm getting annoyed at how long everything is taking but at least this gives me time to mod my case up and possibly get all my parts together without having them bear stock cooling for a week or so.