Retail POS & Report Suite

I need a full-featured POS application tailored for a retail store environment. The system must let me ring up sales quickly, track inventory in real time, reward returning shoppers through a built-in loyalty program, and oversee staff activity from one dashboard... (Budget: $750 - $1500 USD, Jobs: C# Programming, Inventory Management, Java, MySQL, PHP, Python, Software Architecture, Web Development)