If you have an existing design and are simply looking to add Wi-Fi connectivity, Microchip Technology network controllers are a good choice.
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The WILCS02 Wi-Fi® Network Controller Modules are RF and Wi-Fi Alliance™-certified wireless modules based on the WILCS02IC single chip.
This 2.4GHz, IEEE® 802.11b/g/n-compliant IC includes an integrated High-Power Amplifier (HPA), Low-Noise Amplifier (LNA), and RF switches for TX/RX control. The WILCS02IC, a Link Controller IC, features a hardware-based security accelerator and operates at a single supply voltage (3.3V typical).