The problem with the Nolvadex/Proviron combo, is that, according to Dan Duchaine, will completely or nearly completely block the effects of estrogen. This is good for the acutely prone to gyno, but it can be argued that some estrogenic effects are positive and useful for building mass/strength. Arimidex/Liquidex only inhibits aromatization of androgens to estrodiol, but does not directly affect existing estrogen.
If you're not very prone to gyno, I would recommend the Arimidex/Liquidex option. Keeping nolva handy is always a good idea IMO. Proviron, because of its hardening effects, may be more useful in cutting stacks involving low dosages of aromatizing AS or non-aromatizing AS.