i think you and I are thinking on very different scales here.
When 4Q 2008 comes, and new Intel sockets arrive, no one but hardcore enthusiasts are going to buy them. BECAUSE 1) It's probably not gonna hit mainstream usage for another year, or more because of Core2's success. 2) No one will buy DDR3 memory because DDR2 is still good, and dirt cheap.
in the meantime- LGA775 already has so many multi-core options available. But that's already thinking out of anyone's price range.
And what will happen to LGA775 in 08 and 09? It'll still be here, because no one here, especially the OP, is planning on playing Crysis at 60FPS.
btw
radeonHD 2xxx series are utter shit. DO NOT buy them. Go for the 34xx series, cheaper, faster, cooler. you can't argue Cost Effective when youre recommending a cheap video card, and unreleased Intel socket.
like i said- INTEGRATED VIDEO = $0 = Cost Effective