Hi Al,
I have the same gallons-size pool and I spend less than $100 a season on chlorinating my pool. Your first season you would spend more because of the initial cost of conversion, and the cost of a good test kit (which is essential to complete the conversion). But after that initial expense I would think your costs would be very similar to mine.
Chlorine is consumed on a daily basis. So you have to add it daily, either manually, thru bleach or liquid chlorine, or the use of trichlor tablets, powder cal-hypo (which you probably won't want) or an SWG.
Read How to Chlorinate your Pool in Pool School.
I don't think you'd have any regrets about switching. Your wallet will thank you
