Where to buy a decent sytem

Has anyone had any dealings with mesh computers??
Can you recommend any decent pc retailers.
When i see 1.8GHz on a dual core.Does this mean its doulbe 1.8GHz i.e 3.72GHz?

About Dual Core:

http://www.short-media.com/review.php?r=261

Computer company selection depends on budget, gaming computers tend to use the best components and cost more. I have an Alienware Area 51 and I don't recommend Alienware.

Gaming computers:
1. Velocity micro

2. www.falcon-nw.com/ *

3. www.widowpc.com/

4. www.overdrivepc.com/gaming/index.htm

* My personal choice but very expensive.

The term, dual core, refers to the architecture of the chip(the way it handles instructions), the clock speed is not actually doubled.
http://en.wikipedia.org/wiki/Dual_Core_Processors