Me and my husband were in exactly the same position as you are - we were desparate for a dog but were both working full time. We very nearly got a chi pup a few years back but decided against it at the time as we didn't think it would be fair to leave it all day on it's own. Since then I started my own business so that we could be home enough to eventually get a dog and although I still work full time my husband now works from home which meant we were able to get our chi, Max in April this year. Hopefully in the next couple of years I will be able to work from home too so I can spend more time with him!
I know many people have a dog and go to work each day but everyone's situation is different, neither me or my husband have had a dog before so we were worried that if one of us wasn't home with the dog that we could have training issues etc. I think if being left home all day it would be fairer if you have 2 dogs so they have company but I also imagine bringing up 2 puppies at the same time would be very hard work! My advice would be to take plenty of time to think about the options you have and don't rush in to anything - good luck!