You've got this the wrong way round. Overclocking saves money by making lesser hardware run as fast as more costly gear.
I for one love my DFI NF4 Ultra-D, I can't speak for the latest crop of Nvidia boards as I don't own any. Neither do I favor Multi-card VGA arrays be they Nvidia or ATI based. Double the money, double the power, double the heat for perhaps 150% performance. That's well beyond my cutoff for diminishing returns.
Oh, I get it. 1 You don't play at 1920x1200. 2 You love your quad core CPU. 3 You like to play games that I don't. 4 You prefer Sean Kalinich's impassioned rhetoric to that of Tom Petersen.
That you actually noticed a speed-up in I-tunes with a CPU "upgrade" blows me away. Now, I uninstalled that Apple malware immediately after trying it but I can't say it seemed slow with my then A64 3000+ single core @2.4Ghz. If I-tunes doesn't run acceptably fast on a quad core CPU you should inform Apple so they can fix the bug. Millions of people running I-tunes on netbooks would thank you for your selfless efforts on their behalf.

