The OS you're using, and the fact you game, doesn't make any difference at all, to what RAM you should choose? You only really need high quality RAM, if you intend overclocking For just running Vista, +/or gaming... any 'value' RAM would be perfectly adequate. As for good brands: Anything from Corsair, Crucial, Geil, G.Skill, Mushkin, Adata, OCZ, etc in your price range