Anyone have any recommendations for a sturdy X style stand? I play quite vigorously so I don't want the piano to be moving around while I play.

my teacher uses a X stand for his. so, need i say more? actually, some X stands are more sturdy than others, usually not the cheapest one.

Any links to good ones?

I have a double braced Proel stand. Quiklok are a good brand too - plenty of choice. You might find for seated / with pedals play, that something like the quiklok Z726 would suit better than an x stand.

My Guitar Center carries a lot of Proline double braced X stands. Mine is very sturdy, however it is also holding a very heavy Kurzweil K2600X. I think that the sturdiness of an X stand depends on the size and weight of the keyboard. The heavier the keyboard is, the less it will bounce around. Additionally, the deeper the board is, the less likely it is to slide around on the stand due to not properly resting on all of the rubber pads.

I just bought a platform-type stand made by "on stage". I will be giving it a very rough workout once it gets here (crazy concerto with near-constant fortissimo forearm tone clusters). I'll report back once I get a chance to try it. Cost=$60 at music123.com

Three things I liked about it were 1) your feet don't get tangled in it as easily as an X stand, 2) weight capacity is over 300 pounds, and 3)folds up into itself for storage/moving. I've never used one like this before, though.

those are good, the more expensive the better:

http://www.amazon.com/Yamaha-PKBX2-Double-Portable-Keyboard/dp/B00079DRUO

http://www.americanmusical.com/Item--i-YAM-YKA7500-LIST

The ones that Signa posted are good. I'm currently using the YKA7500 for my Yamaha P140 (P140 is around 40 lbs).

You might not like the legspace, but it really depends where you position your bench. I have bench slightly further away than normal from the DP and I'm quite comfortable with that.