I built a lot of websites, I will recommend to all of my clients for choose a responsive template(i.e. the template has a mobile skin). Nowadays, a lot of people use Tablet and Smart phone to browse Internet. Even some of my friends are very rare to open their computer. They like to sit in their living room and use their phone to browse online. If you have not a mobile skin for your website, I believe you will lose 30% visitors. Moreover, most all modern browser support HTML 5. HTML5 can supports different screen size, that is easy to build a responsive template! Thus, I highly recommend you have a mobile skin for your website!