The "best" one is the one I am working on, since it does not yet exist. It will:
- Allow operation as an access point
- Have a web server built in
- Have extra memory for storing web content
- Talk to the Arduino host board using I2C or SPI (or both) in addition to offering the UART.
So far, I have yet to find this. There are a few based on the Ganispan 1.2 device, but this has limitations that prevent it from using the latest GS firmware. The official Arduino wifi shield uses SPI, which is great, but the HDG104 has limitations that prevent it from meeting my needs.
Its been frustrating, but I determined that I need to build my own.