korean av bus
Humm, nothing about the Memec board...
Well, the AvNet board does have a 50-pin header. This should be simpler, but less IO. With the other interface, you don't have the choice but to make your own PCB if you wish to interface to the connector.
Though, I did create double-sided PCB in the past. It's not that hard once you know some good PCB programs. Myself I use ProtelDXP, to end with Gerber files, and I send them to Olimex. Olimex does have a lot of advantages, pricewize and featurewize, compared to the PCB manufacturers here in North America. If you do so, just make sure you follow the rules and board size established by the PCB manufacturer.
The last thing you'll need is some skill in soldering the surface-mount connectors and components.
I mainly look at AvNet myself because their Spartan-III board have 400K gates, a lot of IO, have built-in high-speed interface (Ethernet), have a real video port (full 8-bits per color, with a video DAC), and especially, for their PCI form-factor (which can be slotted into a PCI port).
One of my future project is to add a daughterboard, with a second FPGA, and program the main FPGA as a PCI interface between the PC and the second FPGA. Then, from the PC, it will be possible to configure, on-the-fly, the 2nd FPGA. This will make a re-configurable hardware card, re-configurable by any software, to perform any specialized functions. For example, fast matrix operations, and operations that are usually found in vector computers. x86 processors always have lacked those high-end features, whith the closest thing approaching this being the MMX registers. Now, I could then just design a program that download a binary file to the target FPGA, and do those fast operations! Such boards does exist, if you're ready to put 2000$~5000$, but what if I could do something similar for less than 200$~300$ (by eventually creating a custom PCI card)... The thing for the high prices of those boards is the limited number of cards the companies sell, and the work staff involved in creating this single board. Now, this could be an intereting open-source project!!!