My suggestion for a starter speaker is one of those big box audio stores.
Others will disagree, but in my opinion, the big box are a good source of products for the beginner. Why? Simple, the big box store are typically quite aggressive in pricing, have a long term business goal, and will generally service the product that they sell. All important considerations for any person.
Circuit City, Best Buy are the two largest audio stores, and if you can avoid the sales pitch for the extended warranty or audio cables that cost half the price of your equipment, can represent a good source for basic audio/ theater speakers.
They will have a fair selection of well established brands of speakers. Doesn't mean that these are best speakers on the market, just that the brand will be well established or have a wide appeal, and will be generally of decent quality.
There are better speakers which are not readily available through the big box stores. Some of those brands, are sold only through the internet, while other brands, will only be sold through the finer audio stores and/or a few select mail order firms. The common thing about these other brands of speakers is that they will be frequently mentioned on this and other boards.
Remember, just because something is highly advertised, readily available, or highly touted, doesn't mean that it is a great product, or even the right product for you.
Let your ears do your shopping and buying. It is a lot of fun, and in the end, it is your ears that have to listen to what they have bought.
And if you must buy an internet speaker brand, may I suggest Axiom. Even the audio "rags" like Axiom. And the members of the audio boards are absolutely raving about the product line.