Generally speaking, if all you're going to do is web browsing, word processing, and playing simple games then a quad core processor is what I'd recommend. The reason a quad is needed is that web pages have become resource hogs over the years, and some programs that you might be using will run much better on a quad core than on a dual core CPU. Additionally, 8 GB of RAM will handle almost any operational challenge it's given except in the case of very high end gaming, video editing, and other intense types of processing. One caveat I would make is that you also have to look at what you might be doing on the computer in the next few years so if you expect to become more of a high end user down the road, then don't "under-buy" on the CPU today. Hope this helps!!!
33 Years Computer Experience & IT Support