Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
Thanks, I went with ED, the airmiles thing might go towards the currency conversion costs... but it seems the F-4 which I've just bought doesn't have airmiles...oh well...I don't use DCS within Steam, so I do not know with any certainty, but I have some opinions. If you are not going to use any community supported mods and keep a "vanilla" setup, I would bet Steam works absolutely fine. I believe if you run through alll of the modules on the ED site, you will see some that are not compatible with Steam (those modules may be ones you are not interested in). My reason for doing "straight ED DCS" is so that only ED can tell me how to use the software I invested $$$ in and it is unlikely ED would do anything to damage the customer relationship, whereas Steam doesn't quite have that same incentive. My experience with ED (it has been many years...I think since Lock-On in early 2000s) has been quite good (with the RazBam exception). ED has provided continuous product support and improvement over those many years and it looks like things are going to get even better in the near future.
I hope this helps with your decision. If it was mine, I know what I would do.