Yes, definitely go with Windows 7 Home Premium 64 bit, it's well supported and faster, and as you said 32 bit limits you to something like 3.2 GB available to Windows. Nobody uses 32 bit Windows these days unless their hardware won't support 64 bit. The Zotac you linked is not the same - it's only a 650 Ti - the 650 Ti Boost is a new SKU designed to fill the gap between 650 Ti and 660 (& compete with HD 7790). Here's a link to the right Zotac card; http://www.newegg.com/Product/Product.aspx?Item=N82E16814500293&IsVirtualParent=1 That one looks better, right? It has 2 GB DDR5 and 2 fans and looks more like a real video card.