lets give you an idea of what you can get for $4000 invested in a desktop and see how badly it would be the sh** out of your alienware comp right now.
DFI Lanparty UT SLi-DR $180
AMD athlon FX60 Toledo $1000
WD Raptor 150GB 10RPM $330
WD Caviar 400GB storage $190
Thermaltake Silver Kandalf $229
G.skill 2x1gb Dual Channel $220
eVGA Geforce 7900 GTX $600
Creative Labs X-Fi Fatal1ty $285
NEC 3550A $30 x2
FSP FX 600watt PSU $140
Razer Diamondback $45
Saitek Eclipse $30
Logitech X-530 5.1 $60
Viewsonic VX922 $340
That is not even $4000 yet, and it is about 1millionx better than your current computer.
DFI Lanparty UT SLi-DR $180
AMD athlon FX60 Toledo $1000
WD Raptor 150GB 10RPM $330
WD Caviar 400GB storage $190
Thermaltake Silver Kandalf $229
G.skill 2x1gb Dual Channel $220
eVGA Geforce 7900 GTX $600
Creative Labs X-Fi Fatal1ty $285
NEC 3550A $30 x2
FSP FX 600watt PSU $140
Razer Diamondback $45
Saitek Eclipse $30
Logitech X-530 5.1 $60
Viewsonic VX922 $340
That is not even $4000 yet, and it is about 1millionx better than your current computer.