I think your best bet would be making a list of necessary functions.
Do you need a theme with a gallery? Do you need something with a single column or multiple ones?
I would say, look through a bunch of business websites or just some themes and pick the ones that have a design that you like. And by design you like, I mean aesthetically pleasing and also meet your level of functionality. If you're only going to make a business website to inform people about your company, then you probably won't really need e-commerce supported ones. Unless your reasoning for making this website was to start an online business selling stuff. :>