If you just want the anti-estrogen properties, than just take Arimidex/Liquidex.
I always keep Nolvadex on hand; it's the only thing that will stop gyno once you see symptoms developing. If you are doing an estrogen blocker, still keep Nolvadex on hand, you never know--the dose you are taking might be too low for you, you might be forced to miss a day or two of taking the estrogen blocker--Keeping a box or two of Nolvadex is the best insurance against growing a set of titties IMO.