^Don't mind him. He has this habit of recommending AMD/ATI to everyone, no matter what. I would heartily agree with him when the performance is superior or when AMD offers more value for money, but it is not so in this case.
As for the quality RAM, it really does not matter unless one is Overclocking the RAM's, which I believe is not the necessity here. If it were, I don't see in the first post. The mATX board for Core i5 has 4 RAM slots and can handle any graphic card thrown at it. Cut short of features, eh? For non-overclockers, no feature will really be missed. Besides, that ASUS board is sub par considering the MSI 790GX-G65 @ 7k, which is far superior.
650W PSU? It is pointless buying it for the OP's requirements. Has he said anywhere that he wants to use more than one GPU? Since he has not, the Seasonic S12II Bronze 500W can handle any single GPU based desktop system. No need to buy a 650 watter with a puny 2 year warranty and unsleeved cables. The VX550W is overpriced at 5.8k. Hence, the Seasonic PSU is the most VFM, even though it has a three year warranty as opposed to Corsair's five.
There is no need for a gaming keyboard as it is not worth buying and a gaming mouse has been recommended. By no means is the Gigabyte P55M-UD2 a lowly motherboard. There is no point in trolling against Intel/Nvidia. That will be good at Semiaccurate.com, but this is not that website, is it? If you were to make sensible statements furthering your arguments, I'd be glad to agree with you, but somehow you don't want to learn.
Imposing one's fanboyism all over the forum, especially to newbies or those who don't know much about computers is not the correct thing to do and I hope some people understand that. Let the performance and value for money speak and let it suit the needs of the question asker. End fanboyism and trollposting.
As for the query about the S2409W, asigh is a user and so are Cool G5 and Ethan_Hunt. I guess they could tell you about. All are amazed with it. No one in the forum uses G2420 AFAIK. I would buy Dell if I were you, but I do not know about BenQ, so please keep your mind open about that.