Although you say they're just starting out, surely you're not their first customer. I'd ask for referrals and to see some of their work. I had estimates done for my driveway (sorry, I don't recall the dimensions) and they ranged from $3998 to $5000 to $7000. The man who estimated the job at $3998 was going to get the job because he gave me good references, I went to see some of his work and he eventually paved my neighbor's driveway and installed a patio and walkway for them, too. I was just about to sign on the dotted line when I needed surgery and my wonderful insurance co. wouldn't pay for it due to it being a preexisting condition. My point is that the least expensive one would've gotten the job due to his professionalism. The others quoted me a price and didn't even bother to talk to me. They came and did the estimate when I wasn't at home, even though I specifically told them I wanted to be there and to talk to them. So trust your instincts but also get references and look at some of their work, if possible.