Custom Desktop:
http://pcpartpicker.com/p/2fNcv
That build is $1500 and I'll comment below on some of the parts. If it's too much money, here's where you can reduce price a bit:
- Asus GTX770 instead (saves about $170)
- different motherboard (save up to $100)
- DVD drive instead of Bluray (save up to $40)
The BUILD:
a) i5-4670K
The best CPU for a high-end gaming rig (there are more expensive CPU's but they add very little currently to performance).
b) Asus Hero Maximus VI:
- great quality, features etc.
- SUPREMEFX audio (similar to $50 or more audio card)
c) DDR3 RAM:
- great quality G. SKill, 2133MHz for reasonable price
- 8GB is plenty for gaming
d) SSD: 120GB Samsung 840 EVO is arguably the best SSD for quality and value. Plenty of space when using an additional HDD.
e) 2TB HDD:
- good customer reviews, and inexpensive
f) CASE:
*You may wish a different case. Not compatible with long radiators.
- 12.5" graphics card supported
- basic but functional
g) Windows 8 64-bit
- strongly recommend over Windows 7
- add START8 ($5) from Stardock to bypass new interface and disable CHARMS BAR on desktop etc.
h) GTX780:
Awesome card, specifically the one I chose with the EVGA ACX cooler and 967MHz base.
*I won't get into the Pros and Cons of AMD vs NVidia. I'm interested in the new AMD cards but the high-end models don't yet have non-reference coolers.
**If you absolutely MUST get a new AMD 290X, then use your onboard iGPU for video while waiting for good cards to come such as an Asus R9-290X with a D2C type custom cooler.
DESKTOP vs Laptop:
If we ignore the screen etc, then $1500 with the GTX780 build is probably almost 2x more powerful (i.e. 60FPS vs 30FPS at the same quality) than the laptop I chose with the 770M graphics. That also VARIES between games.