Core 2 duo is overkill for most emulation. I use an Athlon 64 3500+ without a single hiccup on anything. For a HTPC though it is perfect. I haven't kept up with the models too much since I bought my laptop (C2D 2.00 Ghz) but read reviews to find out which model is most overclockable. You might not care now, but when performance starts to seem less impressive you can jack it up a few Ghz and stave off an upgrade for a while. Quad core (unless daddy's paying) is not worth it. For a server, YES. For personal computers, only in benchmarks. You'll get better performance increases spending extra money on better RAM, harddrives, etc, rather than a two more cores. One day this will change, but for the next few years... If it's going to be on 24/7 look into a power efficient power supply with active PFC and an efficiency rating of 80%+. Also, if you are going for a traditional case take a look at the Antec Nine Hundred Gaming case. It has MASSIVE cooling for when you do the overclocking, and looks good too. It is also pretty quiet on the low settings. It has a 200mm fan and three 120mm ones. Jeez. Also, be sure to buy a motherboard with more than 2 SATA connectors