FPGA board with an ADC

Hi, I am looking for an FPGA board with preferably a Xilinx FPGA (Spartan

USB 2.0 (preferred) Serial Port Ethernet

The board must have a single or dual channel ADC with sampling speed in the range of 10-20 MS/s. ADC resolution should be somwhere around

In addition to all mentioned above, the board must have 32-64 MBytes of on-board memory (SSRAM is preferred).

Any links...............

Thanks in advance

Farhan