I think simple is the best way to go. I've seen the Baby Bjorn ones and they are great. We went even simpler and got the Target brand one for our son. We had a seat already for our daughter but unfortunately, we found there was a design flaw in the seat for boys. When he would tuck himself to sit and pee, he would end up peeing between the seat and the potty chair and it would make a big mess. The one from target has a seat that has a plastic piece that extends down into the collection cup. This meant no more peeing between the seat and the cup and no more big mess all over our bathroom.
Also, with a little boy, beware of aiming. Be prepared for the aiming part (when standing up) to take a little time and make a little mess. For the aiming, I recommend a trick that my cousin uses with her Kindergarten boys. She has cheerios in the bathroom. The boys get a cheerio and throw it in to the toilet and then aim at the cheerio and try to sink it. Alternatively, I've heard a drop or two of dishwashing liquid makes wonderful bubble and helps to improve their aim since they want to make the bubbles.
One extra consideration, since you work, make sure that your daycare person(s) are on board with what you are doing and are being consistent with what you are doing at home. If they aren't then it can take longer to get there. You may want to check with them if they are or have dealt with potty training before. There may be a routine that they use at daycare that you can use at home as well to keep everything routine.
The best advice is to be patient. Don't expect too much at first. Also, be prepared for the peeing and pooing to come at separate times. Things to prepare for once potty training is complete or almost complete... You will need to allow extra time for getting ready to go anywhere as they will undoubtedly have to go as soon as you are ready to walk out the door. Also, be prepared to visit every public restroom on your trip to run errands or wherever you may go. (I know I missed diapers for the first month or so after my daughter potty trained.)
Good luck.