This is my first build, quite an upgrade from my previous computer (iMac 2009). I haven't had any major issues and gaming is very smooth. I'm able to encode videos in seconds rather than hours. Overall, I'm pretty happy with this build. I could've got a better GPU, but I'm looking to upgrade within a year or so, so I didn't want to go all out. I purchased everything off of Amazon (free 2 day shipping), so some of the prices are a few dollars more than the cheapest place you can find them.
I'm currently running the CPU at the default 3.4GHz, although I have OCed it to 4.2GHz and maintained lower temperatures. I don't plan on running it regularly overclocked because I don't want to stress it too much.
I didn't get an SSD originally because I feel as though they are too expensive. I bought one off of Craigslist for $40 and am currently using it as a boot drive.
I had a copy of Windows 7 Ultimate that I was running in dual-boot on my old iMac, so I didn't need to buy an OS.
I got the monitor on Amazon for considerable less than everywhere else. It's not the best, but it works enough for me. One day I'll get a 27", but that will only happen after they come down a bit in price.