Welcome to the forum, lots of good folks and experience here for us newbies to take advantage of. I'm new to beekeeping myself...got interested in late October and got my first bees mid January. Loving every minute of it. rbinhood is correct, totatlly addictive! :-D
As to the all mediums route....that's the direction that I went and so far feel like it's been a solid choice. I actually went with all mediums, 8 frame. As you will quickly learn in beekeeping, no opinion, decision, or method garners unanimous approval. However, I'd have to say my decision to go all mediums has been met with reactions of agreement and approval from about 90% of the beeks I mention it to. It seems to be becoming a popular trend....
Good luck! :)
One afterthought.....You say "bee business"....If you're truly looking at it as a business, understand all mediums will increase your equipment cost. You'll need more boxes, more frames, more foundation, etc. etc.
Some will argue that the money you save on back surgery and PT will more than offset that... :laugh: