The second PCI-E slot on the Asus P7P55 LX is x4, which is probably not worth adding a second graphics card to.
The motherboard in this combo, I believe, has two slots at x8: Intel Core i5-750 & EVGA P55V 120-LF-E651-TR $270 ($20 rebate).
The deal on that PSU & RAM is fantastically good, so I'm a bit reluctant to point out that OCZ RAM has a bad reputation for being difficult to run at the specified speed/timings/voltage, as you may have no problems, and it will be very difficult to find any other combo of RAM and PSU for a similar low price.
What size heatsink can your case accommodate? The Cooler Master Hyper 212 Plus below $30 is probably one of the best choices you can make for cooling performance.
I would pay as much seems reasonable to put into a cpu cooler paired with that RAM. At some point it would be better to put aftermarket cooling $ into a better CPU on stock cooling.
So maybe $20- 35.
Not extremely loud would be nice.
I have been putting my case in my closet with the cables running under the door. Then opening the door to playing games or if it's a hot day to stay cool. So quiet is not critical.