Currently both models, the V21-H8 and the V51-H6 are on sale for the same price of $149.99.

The main difference between the two is that the V51-H6 is a 5.1 Channel Home Theater system while the V21-H8 is a 2.1 Channel Home Theater system.

Both sounds great and are priced at a really good deal. In particular the V51-H6 since that is usually more expensive than its V21-H8 counterpart. Check them out.

Get the Vizio V51-H6 here.

Get the Vizio V21-H8 here.