It's that you should buy yourname.com! But chances are you already knew that.
-Purchase the name of yourstartup.com
-Add yourname.com to your cart
Even if you use only one now, that's fine, just buy both your brand and your name so no one else can get their hands on either one.
I'd recommend using instantdomainsearch.com to quickly search for available .coms.
BUT of course chances are your top choice may not be available or a domainer is asking way too much money for it. Should you buy a domain on a new extension (like .attorney, .dental, or .pizza)?
Knowing how much to charge for a product or service is going to be a make or break decision for a successful business. Price too low, and you will probably receive a ton of business but won't make ends meet, but price too high, and it will push customers away.