Hey guys,
Thanks kindly for all the help! I ended up going with the MSI 6950 2GB. Fortunately, it appears I was lucky and was able to unlock the shaders on the card, so I wonder if some of the newer cards in circulation have not had the shaders lasered?
Sorry for not having any pre-unlock screens, but here is the GPU-Z screenshot of the shaders (apologies if it's the incorrect format - I'm new to this!.
At this point, do the usual GPU overclocking principles apply, or would I be able to immediately apply 6970 clocks and expect it to run hunky-dory?
As always, thanks kindly for all of the advice and insight.