I dont understand your question. You can buy any type of Tivo off Ebay and set it up with service and you are covered if it blows up. From Tivo specifically I think there are a few Bolt models and Amazon and Weaknees will sell you new or refurbished units. Regardless, once they are added to your Tivo account...no worries. If you meant "what model SHOULD I get?" That is another matter.