You can build a PC that will beat it with the bare essentials... more then half the price. Only thing they have that we can't get yet is the PhysX card. Otherwise:
FX-57: $811
x2 4800+: $630
^ your choice
4x 7900GTX 512MB: $2199
PhsyX Engine Card (not realeased): $300
Sound Blaster X-Fi: $179
2x WD Raptor 150GB: $562
WD Caviar 400GB: $182
2GB GSkill 667MHz: $298
Total: $3720
No monitor, no case, no PSU, no speakers, no keyboard, and no mouse.
But, if we were to add in round figures of decent products these days:
Monitor: $500-800
Case: $100-150
PSU (to support all that): $450
Speakers: $200-300
Keyboard: $50-100
Mouse: $25-75
Therefore, its anywhere from $1350-1875 for a complete non-bare essential system with pretty good specs in my opinion. You can get good stuff in those ranges. I mean:
Thats a nice 20+in. lcd screen or better
A very good case
A huge watt psu
Probably the z5500 speakers
Plus any Logitech keyboard and/or mouse
All of the above listed would fit in that price range.
So:
$3720+$1350 = $5070
$5070+$811 = $5881
$5070+$630 = $5700
$3720+$1875 = $5595
$5595+$811 = $6406
$5595+$630 = $6225
Anywhere from $5700-6225 would be an awesome system that would out-perform that Dell depending upon the accesories and processor you choose; otherwise, it's the same build as the Renegade.
Plus, you could go with water cooling and still come up $3000-4000 cheaper and WAY outperform that overpriced Dell.