for 2000 USD? you'd be damn close.
Lets see.. for 2000 CDN I got:
-a palm TX
-a palm wireless keyboard
-an e6300
-a D975XBX mobo
-an APC line interactive 900VA UPS
-a maxtor maxline III 250g server harddrive
-a 17" LCD NEC 70GX2 monitor
-a gig of PC6400 ram
-a seasonic S12 430w psu.
-a scythe ninja
-a P180
-and a gigabyte 7600gt silent pipe II.
If i can do that... for Canadian dollars... from canadian retailers (!!!) then you'd be really close. I had to add an extra 300 to my system because I couldn't buy from US retailers. You'd have no idea how different the prices are. And the $2000 was tax included with shipping.
Granted, I did some creative shopping and I looked REAL damn hard.
Now.. about your system. There's no way you can expect to avoid upgrading everything 2 years from now. Do you know what we were using 2 years ago? intel socket 478 processors, with ddr400 ram. and 320 gigs was insane. oh and AGP was the king of the world. and sata was a fly on the wall. I'd say your $4500 system is going to be worth $900 in 2 years.
$4500 on the other hand, will still be worth $4500 2 years from now. (more if you invest)
You know what you could do? Split your budget in 1/2, ditch the high end, save the cash, and upgrade when it gets slow. That way, you'll end up with a faster system 2 years from now AND spend the same amount of cash. You know why large corporations or governments are so damn inefficient? because they have cash coming out of their ass crack. They can spend it on whatever the damn they want, and they can't seem to make an intelligent compromise.
It's your call. You already have the $4500 budget. I'll give you a quick build that would fit $2500
-
seasonic S12-430w $100
-
CM Stacker T01 $115
-
Seagate 7200.10 320gig $95
You'll want a couple. Take 4. $380
-
benQ 16x DVD-RW $27.25
-
OCZ gold 2x1g pc6400 $157 Take 2. $314
-
Gigabyte DS3 $150
-
Core 2 duo e6600 $459
-
Creative X-fi $122
-
X1900XT $313
Total: $1980.25 before tax and shipping
Isn't it remarkable what a little corner cutting can do? This system would smoke ANYTHING you own right now, and probably anything anybody on your block owns for the next year. Plus it has your 1.2 tb required HDD space, and 4 gigs of ram.
With the left over money, you could buy any monitor and any speakers you want.
These arn't even final prices. Newegg is expensive, and things could be gotten for cheaper.
$4500 probably would have gotten you a marginally better system. now instead... 4500-1980.25 = $2519.75. You have $2519.75 to spend on your next system. Probably more because you can reuse the case and possibly psu.
It's your call, and your money.