I dunno about "top of the line" for $800, but definitely decent. If you're building a gaming rig with a $1300 budget, I might spring for SSD (~$250) and a high-end video card ($300-400). Those make the biggest impact, so splurge there. You should be able to get the rest of the components and still stay under budget without much trouble.
My 5 minute browse on newegg came back with...
Power: $115 (once you try a modular PS, you can't go back)
Case: $100 (love my Antec cases)
CPU: $290
Motherboard: $120
Memory: $54
SSD:$210 (I haven't tried this one personally, so do you homework on SSDs. They're worth it.)
Video Card:$320
Total: $1209 + tax
I'm sure someone else find better deals; I just chose the brands I usually stick with.