Going online for Dell's shop, you're spending $1300 (for default build, no tax or shipping) for a 2.8 GHz quad core, a 500 GB hard drive, 3 GB of memory, and an two oldish video cards in a crossfire, that I doubt are better (or only slightly better) than an ATI 5850, yet you can add a second 5850 in later on when you actually find a lot of games that need it.
Go on newegg.com, buy the parts yourself, and build it.
$1300 should easily get you 6 GB of nice RAM, a 5850, 2x 1 TB harddrives that you can put into a RAID 0, and a good Intel Quadcore (assuming you want Intel), plus a good powersupply you can use in future builds, and get a solid Steel case to boot. If you get a lot of stuff on sale, you might get lucky enough to cram in a SSD into your budget too, which will offer massive speed benefits.
Drop the liquid cooling, get the Cooler Master 212 + Artic Silver 5. It's just as cool as liquid cooling as far as your CPU is concerned, while much easier to install and less prone to damage. Liquid cooling is only really better if you want to massively overclock your CPU (unlikely if you aren't considering on building it yourself from your OP), or if you liquid cool your video card(s) as well, at the very least. RAM or hard drives too, if you want. And 5670s do not need to be liquid cooled.