Definitely go with an inexpensive theme. It's a great value, gives you good design out of the box and lets you focus on building the more critical elements of

Definitely go with an inexpensive theme. It's a great value, gives you good design out of the box and lets you focus on building the more critical elements of your service. Design is important. Initially though you just need something that looks good, quickly and inexpensively. Once you're profitable you can invest in better design. I would go with bootstrap based themes. I see more and more corporate sites using bootstrap. It looks good and is easy to develop with. As others have mentioned if your site is SaaS watch out for themeforest and their license requirements. Otherwise you'll be in love with a theme that will require an extended license that is $500 to $1,000. More friendly license terms for SaaS are offered by http://wrapbootstrap.com http://wrapbootstrap.com. I'd look there first. Good luck getting up and running fast.