But what I want is a super-duper gaming comp that is powerful, can run all current games out there with good FPS, load things speedily and to fit within a budget of about $1500-$2000.
1500 - 2000 $ is more than enough for a System that runs all current games.
Some things to consider when building a new PC:
1.) buy a good Case.
PSU mount a the base of the Case: PSU will suck in cold air an will run cooler.
At least mountings for 2 Fans with 120mm: one at the front as intake, one as out-take at the back of the case. Filters at the intakes to reduce the dirt in the case
Rubbermounts for Harddisks to reduce noise
Long GFX-Cards should fit inside the case, in some cases it's possible to remove parts of the HD Cage
Both Sides of the Case should be removable, and the Mainboardtray should have openings to rout the cables.
2.) don't buy a cheap PSU
It should have a modular Cable Management and at least 550 - 750 Watts. Important is the Current on the 12 Volt rails, more is better
3.) get a good Mainboard:
Even if you don't want to overclock: don't buy a Mainboard without reading a Review. A thing to consider is for example the number of fans the board is able to control, and the software / Bios of the Board.
4.) buy a good CPU cooler:
at least a 120 mm fan, read Reviews about the noise. Most Cooler can keep a CPU cool, but not everyone is silent.
5.) If it should be fast, you have to buy a SDD
120 GB are enough for Win 7 and Games
6.) If you have a SDD, you need a HDD for Stuff
Don't save MP3, .docs , Pictures or Movies on the SDD, get a 2 GB HDD for that.
7.) Be a pro, buy Windows 7 Professional 64 Bit
The Professional Version has some useful features that the Home Version doesn't have, like the remote desktop host.
8.) Look for a silent GFX Card
Read the Reviews of the Cards you want to buy, and keep an eye on the noise level in Desktop Mode.
Things you don't need:
A Sound Card. Since Windows Vista there is no benefit for a Gamer any more to have one.
More than 8 GB of RAM
SLI or Crossfire, Dual GPU GFX Cards.
Nice to have:
Water Cooling (Silent, but nor cheap)
A Wireless Headset - no Cables, and most of them have a good Surround Sound Emulation.
And for the FreeSpace Gamer:
If you don't spend all of the 1500 $ get a HOTAS Joystick