Well I certainly agree that it's better to build your own, it's not always cheaper. OEM's get kickbacks from companies (even MicroSoft) to stick crapware/shovelware onto your system. Some of this is passed onto the customers in the form of a cheaper price. Of course you are stuck with whatever piece of crap PSU the OEM has used. You also have a cutdown version of a motherboard that's made by whomever and the BIOS / UEFI will certainly have you locked out of most everything associated with overclocking.
When you build your own, and assuming to you do your homework, you will know exactly what you are contending with based on your compromises in the pursuit of meeting your budget. You don't have to contend with unloading all the above mentioned crapware. You will have a hard copy of Windows that you bought, so you won't have to make the System Backup DVD's that most OEM's make you do because they were too cheap to give them to you. If heaven forbid one of your pieces of hardware fails and you have to RMA it, you can just send the failed hardware instead of the entire system.
One last thing that's not easy to measure, but is certainly the most important thing about building your own (according to me anyhow) is the sense of pride and accomplishment you get when you've successfully taken a box full of parts and turned it into a working machine. There is no sweeter sound as the sound of the first POST beep as you are holding your breath on your first power up. You just don't get that experience with buying an off the shelf OEM computer.
I am sure I could go on extolling the benefits of building your own computer, but if the above hasn't convinced you I'm not sure going on will help. One caveat to this, if you aren't experienced with upgrading computers in some form or other, and you run into trouble it can be a daunting and frustrating process to troubleshoot. However with this caveat there is an upside, if you are able to troubleshoot the problem successfully, there is a huge sense of accomplishment.
Good luck.
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