I get from your perspective as an oiler fan, that getting top centers has been an issue, while getting dmen has not. But from an avs perspective, its been the total opposite. Since Blake, we havent had anything close to resembling a #1 dman. On the other hand, we have stastny, duchene, hishon, mueller all whom could play top line center if needed.
As for centers being moved since the lockout, well theres tons. It really depends on what you consider a #1 center. As for your list of dmen, it seems your willing to include top and middle pairing dmen, so i included a list of top 2 centers. Just from the very little searching i did,
Gomez, Forsberg (philly and nashville), Andy Mcdonald, Fedorov, Weight, Fisher, Drury, Briere, Saku Koivu, Ribeiro, Savard, Antropov, Holik, Boyes, Vermette, Cullen, J Jokinen, Thornton, Cammalleri, Stoll and Olli Jokinen.
Nothing spectacular in that list. But i think in the same way its hard to trade for the richards' and duchenes and kopitars, its equally as hard to trade for the Greens, the Doughtys and the Myers'.