Agreed. Go with a 2500K instead of the 2600K unless you just want to burn the money. The 2600K has hyperthreading, but that's the only real advantage as clock numbers can be upped on the 2500K.
some games aren't optimized for hyper-threading, and having hyper-threading on can actually have a negative impact on performance.
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Benchmark Results: CPU Scaling : Battlefield 3 Performance: 30+ Graphics Cards, Benchmarked
@Ecthelion
you don't need extra SATA cables either, your motherboard will include some.
for example;
ASUS P8P67 includes 4 sata cables