My DH works for a water treatment agency and we are on well water so he is a bit of an expert in this. He said there shouldn't be chlorine in your well water so that shouldn't be a concern. Do you know your flouride to be high? If not, you can skip the RO. Dh said your other numbers look good, like you have clean, soft water. Do you happen to happen to know about other contaminates, like nitrates, that would necesitate an RO unit?
We have an RO unit we bought at a club store for about $250 and installed it ourselves. Just a thought if you want to save some money.
As far as the sulfur, Dh said that if your well pumps to a tank, you can put an aerator on the tank which will cut the smell. Otherwise he is not sure, but a filter won't help. Not sure about a conditioner or softener.
Feel free to ask more questions. HTH!