I just have a Laptop right now (no accessories) and this will be my first desktop, so I don't have anything to reuse. I didn't know about the ethernet being on the mother board or the fan built in the case, so I am learning. What component is integrated sound incorporated on?

Found some cheaper desktops, are these pretty good specs?

http://www.newegg.com/Product/Product.aspx?Item=N82E16883241007

http://www.newegg.com/Product/Product.aspx?Item=N82E16883113104

http://www.newegg.com/Product/Product.aspx?Item=N82E16883227165

What do you intend to use the computer for?

Again, none of those are *bad*, but you can build something yourself for cheaper.

OK. Add $150 for a monitor, $100 for OEM Windows Vista w/ 7 coupon, and $50 for keyboard and mouse. That's $820 so still cheaper than the comparably spec'd system you linked which was $1089 if you add a similar monitor [the Newegg one in the first post].

All of the other options you've linked apart from the Newegg one have really poor graphics that won't play games [The GMA 3100 one will barely run the Windows desktop].

Guide to buying, whether you buy OEM or build one:

Graphics card: Either Radeon HD48xx OR Radeon HD58xx OR Geforce GTS/GTX2xx. Nothing else is worth buying, seriously, do not try and go below that. The Radeon cards tend to be faster at the same prices as the Geforce at the moment.

For (gaming) CPUs in your price range you want Athlon II X4, Phenom II X3, Phenom II X4, Core 2 Quad Q8xxx/9xxx, or Core i5 7xx/i7 8xx/i7 9xx. Nothing less. Below $190 the AMD ones are cheaper than similarly performing Intel ones, and above $190 Intel is cheaper than AMD. But any of them I listed will not bottleneck games.

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Sound is integrated on motherboard. Most cases come with fans, some don't though so check.

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As jefforange said, exactly what do you want to do with the computer? What games, applications, settings and resolutions?

Honestly, if you can put together Lego blocks, you can build a computer.

This.  It isn't complicated at all, really.  Just you have to be a little bit more careful than with Lego.

I was going to use a model plane as an analogy, but a model plane is 100 times more complicated than computer assembly. 

Although, if you are too gentle, you will probably never get the RAM fully seated.

Yeah, I had that problem myself the first time around.

I had the good fortune of having RAM problems when I was adding RAM to an older computer, so the problem was easy to find. I wouldn't want to be new to building PC's and have POST beep alarms because you didn't know how hard you really need to press on RAM.

@OP, if you have any second thoughts about building your own PC, I would suggest running through some How to youtube videos. You will be able to greatly increase your performance vs price by building your own PC. I can guarantee that all pre-built gaming PC's are not worth what they charge.

To minimize risk inserting the RAM, it's better to have as uniform support under the mobo as possible, either using all the screw possible to fix it to the case or backframe or using a suitable work top and mounting the RAM before fixing the mobo to the case.
Alas screws and spacers for the mobo are often in short supply with cases, better buying some spares.