I built my own pcs for about 20 years. The last one cost me about $5000 (in 2005), but it was sweet. Four flat screen monitors, 3TB of disk space, a 1000W power supply, 4gb of RAM, and two graphics cards with a bridge.
I built it strictly for gaming and graphics. I ran my business off my laptop.
The only caveat I have for your own build is to be certain each manufacturer and/or vendor has quality customer service and tech support, and to start and finish your build soon after buying your parts. There are few things worse than getting a defective mobo, and when you try to replace it finding that the new model has a configuration that will not work for the build.
Also, make sure you have a functioning computer with a CD or DVD drive and an Internet connection handy. I also keep binder with all my software and updates (along with registration information), and drivers with updates. That binder also contains a list of installation quirks, if any.
Be prepared to tear your hair out, and then you won't have to.
