Re: PSU QUESTION!!
Your system is fine on the 450.. Its not just watts, also Amps, and the corsair is fine for thsat.
When/if you upgrade your gpu to a bigger card, then think about a new psu... YOU"LL actually need one, but till then, don't worry.
As an example of corsair.. ran 2x260's 2 hds, 4 fans and an oc q6600 with a heat sink, on a 520hx.
Foldie = i7 950@ 4.0Ghz Gigabyte x58a-ud3r EVGA 970 SC Corsair H100 Corsair hx520 3x2gb OCZ Gold Corsair 650D
Woohoo = L5639 @3.1Ghz EVGA SR-2 gtx 260-216 Hyper 212+ Corsair 1050hx 6x2gb Corsair XMS3 Blackhawk Ulra
Alienware 18 - SLI 770M 4700mq 16Gig