I've been a member at PokerVT (didn't have much cash stuff), Drag the Bar, Dueces Cracked, Poker Saavy Plus, Cardrunners, and Poker Zion. They all have some good videos and series. But for me i really liked the Poker Zion courses. i seem to get more out of their style of video, rather than just watching someone in a live sweat situation. They send you training content each week covering different concepts for 24 weeks. I started with "The Roots" course and it covers alot of fundamental type stuff, and then the "Iron Lion" course is for more advanced players.
They have some free vids up on youtube also under Ace Poker Solutions. They just put out a really good one on 4 bet bluffing
But I think they all for the most part they all have 7 day trials, so can't hurt to try a couple of them.