This is a hot subject for me because I get pissed when I see people blowing money on cars, vacations, and God only knows what when they really need to take care of their health. We only have one body and we need to treat it well. First of all, from a health stand point, your dental health is important and it affects your entire body. If you have an infection or disease in your mouth it poisons your entire body. I believe the best investment you could ever make is in yourself. I am not saying that you shouldn't get additional quotes from other doctors, but I do believe it is a worthwhile investment.
Second, I know this will boost your confidence, which will inevitably, improve other areas of your life. If you feel good about how you look it over flows into everything else. You will feel better inside and out.
Furthermore, your teeth form the first impression that definitely affects your chances of attracting the people you desire. The most important characteristic for me is clean, nice teeth. I can overlook many things, but teeth is not one of them. Who doesn't want to kiss an attractive smile?
My opinion is invest wisely in yourself and get the smile you have always wanted!