Which exercise DVD?

So I just purchased P90 (not the x version) and ma waiting for it to be shipped. But now I'm having 2nd thoughts. I have quite a bit to lose. Would I be better off with buying and sticking to DVDs like tae bo, Slim in 6, and JM (one's I already have) and rotate those for 30-60 days? I just don't know if shelling out $70 for Power 90 right now is the best when I can get p90x in a couple months for $120. Just curious if anyone has done this and think p90 would be worth it.. Thanks!

P.S. I'm switching from doing an elliptical at my gym so have had the home DVDs for awhile just not done them in a very very long time.