Dell Alienware Doubt..............?

For rendering purposes, it's true that the CPU and RAM is more important than the GPU. Consequently, the GPU and RAM is more important than the CPU for gaming. Alienware is probably going to be more reliable as well. Dell isn't too popular for being super reliable. Alienware should be very capable of high end work, especially based on you specs you posted. I'd say it's totally worth it, but be sure to keep it plugged in. Power saving options may decrease performance when on battery.