Or you can just find some incentive offers to complete at NamePros and use those NP$ to purchase your .com for free! I've accumulated quite a few NP$ by doing just that and have registered at least a dozen domains here.
I second what GJ says, Namecheap is definetley the best place to register your .com since they offer a free Whois guard (privacy) feature with purchase. GoDaddy charges $9 for privacy.