Estimated selling price for the area can be around $550k range, depending on the overall condition of unit.
My advise is that do not speculate on the prices of HDB and make decisions to sell and buy. Since this will be your home that you are looking at, as long as the price is acceptable for you to sell and purchase your next dream home, you should proceed with your plans. Otherwise, should prices hold strong or even appreciate, what will happen if you sell now and you may regret selling it at a low and buying at a high next year? Or should you decide not to buy first and carry on renting, this amount of rental you are paying could be pretty significant.
Should you require further advise, feel free to contact me.
Real Estate Consultant
CEA Reg R014783H