I hate to rez the whole eGPU topic again but I did a little research and came across a few things.
External GPUs still get bottlenecked by most external interfaces, meaning they aren't that great for gaming. The only external interface that is really fast enough to not horribly bottleneck a gaming GPU is Thunderbolt, and Thunderbolt ports are something of a rarity on PCs right now. Thunderbolt is an Intel proprietary technology, so you won't have it on an AMD system. It is also currently only available on Apple systems, higher end Intel motherboards, and certain Intel based laptops, mostly Ultrabooks I believe.
it is important to point out that users will need to have a Thunderbolt-enabled portable computer in order to do so.
As exciting as it might sound, if you do not have a laptop equipped with the required interface or drivers, you cannot take advantage of MSI’s new enclosure. Furthermore, a Notebook Italia report indicates that MacBook Air owners will need support from AMD, NVIDIA and Apple before they can actually use the GUS II with their ultra-portable notebooks
I am sure that I am beating a dead horse here and I am not trying to stir up another long debate. But wanted to point out a few things
1. A Thunderbolt expansion card(?) is gonna cost $300 to $500 if you do not already have one installed in your APPLE laptop/computer
2. I have not been able to find an eGPU enclosure for sale in a Google search
While I do like the possibility of having an eGPU, I have not been able to find any solid information on whether its even fully available. The fact that for the price of a Thundbolt "adapter" and GPU and its going to need its own power source as well for the GPU.(maybe) I can't really see it as being a viable option. But I do not have all the information to make a complete analysis of it.
Fran, if you do manage to get the information and links for parts to do this I would love to see them. If it is an affordable and viable solution I think there may be some people that it would interest.