Awesome call, dude. The xps700 is just a shiny case filled with second-rate proprietary components. I breifly considered one, but after talking to a sales rep who knew NOTHING about the components utlized by dell (RAM, HDD, Mobo, etc...) I realised that a "high-performance" dell is the epitome of an oxymoron.
Build yourself. Handpick each component. Personalize your PC. And get a feeling of great satisfaction when you put it all together and it runs like a dream.
You've certainly come to the right place