he wouldn't save any money going dual, actually, the Q6600 is the cheaper option...
that's not the one from your original post, either way, more connections doesn't mean it's more powerful, if you use all of the connections on the Thermaltake psu you'll probably be running into problems anyway, the low amperage on the 12v rails (14 and 15) is the main concern, the original psu you linked would have plenty enough connections and had more amps (16 and 16), the only 4 pin molex connection you would probably use is the optical drive and the rest of your buils would be SATA, you could also pick up a 4 pin molex to SATA power connector when you do decide to upgrade, but just because the Thermaltake has all those connections doesn't mean it's advisable to use them all, especially with a power hungry video cards which will probably take most of the amps from one of the rails by itself...
ultimately it's your decision, but the first psu you linked, the cheaper one, was actually the better psu for your build...
this was the original one you linked,
coolermaster 500w, and six 4 pin molex and 3 SATA connectors should be enough...
optical drive- 4 pin molex...
OS hdd- SATA...
2 media hdds- SATA...
6 pin PCIe connector- video card...
all your SATA power connectors would be used, but that would leave five 4 pin molex connectors left over, get a couple 4 pin molex to SATA adapters and you'd be good to go for any other peripherals you might want to add later...