I have two gifted kids.  (tweens) Last year I switched my kids from Noeo science to Supercharged Science because they were bored.  I have been really impressed with the program and my kids absolutely love it. 
I just found out that they are offering free access to this excellent series of science videos just  for homeschoolers.  It includes a guidebook too.  Not sure how long it will be for free, but at least for now you can get it at:
www.sciencelearningspace.com/members/go.php?r=3634&i=l27 Enjoy! 
Kim
www.confabulicious.com P.S. Definitely don't miss this one. Here's the link:
www.sciencelearningspace.com/members/go.php?r=3634&i=l27