What is a good free and simple accounting program?

I need an accounting program for a small to medium sized business with these main features: Customers, Suppliers, Items, AR, AP, Inventory w/ multiple price lists, and sales and profit reports. It should also be able to take more than a 500 customers, items, and suppliers total. Also, it would be better if the inventory will be automatically adjusted based on the invoices and purchases. I have tried many but found them too complicated to use, i dont need general ledgers or anything of that sort, its just for personal reference and record.