ok, so... im looking at several new comps (sony vgc-ra... or vgc-rc...). the only apparent differences, besides price, is the processor and amount of HDD space (both SATA). vgc-rc has a 3Ghz intel pentium d with 320gb of hdd space. vgc-ra has 3Ghz intel pentium 4 w/Ht and 250gb hdd space. and...