Based on your request for an affordable yet good quality interior paint, I would recommend either the Plascon Enamel paint for R155 or the Deco Water Based Enamel Gloss paint for R735. Both of these options are on the more affordable side compared to the other results, and Plascon and Deco are reputable brands that will provide a nice finish for your interior walls. The Plascon Enamel comes in at a very reasonable price and is suited for walls and ceilings. The Deco paint is water-based so it is easy to apply and clean up, while still offering an elegant gloss finish at an affordable rate. Let me know if you need any other details on these options or have additional questions!