Question about keyword domain

found 1 keyword exact .com available with 1300 global and 720 monthly in google keyword tool with CPC of ~5$
competition is not much.22 letter domain name due to 3 big words.but i think there will be no problem.
Should i go with it ?
And where do you suggest to register,i am thinking on internet.bs.
SInce this is gonna be my first microniche site so little confused and also tell me 5$ cpc does mean every click will give me around 5 $ irrespective of add size.
Thanks
Sudeep

Anyone there ?
who could help me out of this trouble.

Im not "tried and true", but read plenty. CPC is the cost for each click for google to direct to your site. So if you are monetizing with AdSense you should expect to get a portion of what the cost would be for a click.

The general consensus is about 2/3 if I recall it correctly. So you might expect something closer to a $2-3 return for clicks, not $5. Ad size should make no difference.