I wanted a machine that would be decent for casual gaming but also powerful enough for sporadic A/V editing work. I splurged a bit extra on memory because I've never had more than 8GB before and just wanted that lightning-fast responsive feeling that is hard to achieve on Windows. So far so good!
I already had a great case and power supply, a SSD and peripherals, so I thought I could budget between $750-$1000. Turned out that I had to get a new SSD as well, but still managed to stay under the 1k limit :)