No, I wouldn't make it, unless you are in a keeper of course.
As you said, Granderson has more value since he's quite a sure thing at 20 HR -15 SB or more, having already reached 20 HR three times and even 26 SB once.
A. Jones has a lot of potential but he's a really young, inexperienced player with a lot to prove. 20-15 would be far enough for him this season, even keeping the current pace. Granderson still has better plate discipline and contact rate of the two, even though Jones has progressed a lot since last season.
Add to this the fact that granderson's babip is only .244, instead of .330 as expected, while jones' one is an absurd .393.
So Granderson is bound to rebound soon, jones is a sell-high candidate right now. Let somebody else pay the extra bucks for him
(As for Saunders, I wounldn't trust a pitcher with 3.76 K/9 and a 4.72 FIP, as explained here http://www.fangraphs.com/fantasy/index. ... oe-in-2009
Hope this helped you!