If you look at processor prices, you'll notice that price and performance don't follow a linear curve and buying the high end products doesn't guarantee you'll reach obsolescence that much later. Find the "sweet spot" in price, buy the product, live with it and don't look back for 3 to 5 years. Don't get too bogged down with these processor core names and forget learning what hyperthreading is all about. It left when the true multi-core processors arrived.