Two questions.

1. If you had $2K to build/buy a hot gaming computer, how would you distribute the money? What % on the video card? What % on memory? Etc.

2. Which is better: desktop gaming or video console gaming?

For that much money, you get both - computer and console
A PC won't play all the games as consoles obviously and the game console will give you a great variety of games pc's won't play
If your main concern is gaming, go with the console, but the games aren't cheap
For a gaming PC, consider which OS you would want, Vista or XP and is this only for games or games and everyday computing
Here is a link with some gaming pc's, their specs and prices to give you an idea what they are going for
Custom Built Gaming Computer System, Custom Business Computers, Gaming PC, Custom Gaming PC, Custom Desktop Computers