The selection of the most suitable Enterprise Resource Planning (ERP) system in Singapore is influenced by various factors, such as the size of your business, the industry you are in, your specific requirements, and your budget. Nevertheless, various ERP systems are in high demand and have a broad user base in Singapore due to their extensive functionalities and flexibility. Below are some of the ERP systems you should think about:

1. SAP Business One: This is particularly tailored for small and mid-sized enterprises, SAP Business One is a complete business management solution that helps organizations manage finance, sales, customer service, and other operations.

2. Oracle NetSuite: As a recognized provider of cloud solutions, NetSuite caters to all organizational sizes. It is a financial management, customer relationship management, e-commerce, and more in one platform.

3. Microsoft Dynamics 365: The ERP system is modern and has integrated functions for finance, operations, retail, and talent management, as well as providing connectivity to other Microsoft products.

4. Sage 300: This system is also along the lines of flexibility and growth, as it is very popular with small to medium-sized enterprises for financial and operational management.

5. Epicor ERP: Heavy in manufacturing and distribution industries, Epicor is a robust solution due to its industry-specific offerings besides that it helps with digitalization of workflows and better overall performance.

6. Infor CloudSuite: Infor is an ingredients-specific and cloud-based solution provider which is capable of being tailored to fit many different industries like manufacturing, healthcare, and retail.

7. Odoo: The open-source ERP system is designed for high customization and cost-effectiveness, making it a suitable option for small businesses that seek flexibility.

8. Acumatica: Notable for challenges like supply chains, Acumatica is a cloud ERP that encompasses applications for financials, distribution, CRM, and project accounting.

Prior to making any decision about ERP system selection, it is essential to perform a comprehensive needs analysis, consider the expected increase in size of the business, and seek help from an ERP consultant for the most relevant system that meets your business aims.