FPGA board with an ADC

Hi,
I am looking for an FPGA board with preferably a Xilinx FPGA (Spartan
3 or Virtex series) with 500k to 1 million gates capacity. The board
should have any or all of the following interfaces.

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
12-16 bits.

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