The three that you mention are three different hydrangea paniculatas. Grandiflora, also called Pee Gee, produces slightly different blooms that start white and turn pink. VS blooms are slightly different and turn a different shade of pink. Limelight has blooms that turn lime and then white. Limelight is tall and often used to create hedges. But selection would be a matter if personal taste; they are all very nice shrubs.

http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=g960

http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c192

http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=293649&isprofile=0&://

Sunflower Homes you might consider Pinky Wink, can get to 10'x10'

My favorite is Quickfire which has lacier, less dense flowers. I also have Pinky Winky, though mine is branched to the ground, not limbed up as hyed's is. Look at lots of photos of different cultivars of Hydrangea paniculata. They vary quite a bit in bloom size, shape, and density as well as some variation of color, though all have some time as white, creamy, or lime which age to some shade of pink. The plants with heavier panicles may cause the branches to bend over, while other cultivars hold their bloom clusters upright as in hyed's photos above. You also want to consider bloom timing (about a 6 week difference in start time here among all the cultivars) and shrub height and width since they regrow quite rapidly if pruned and so are difficult to keep smaller through pruning.