Can anybody tell me precisely what the differences are between the DC07 series and the DC14 series Dyson vacuum cleaners?

I'm not talking about the various sub-modeling, i.e., Dyson Animal, Dyson All Floor, Dyson Intergalactic Star Swallower or whatever. Those just refer to what accessories come bundled with the basic unit.

I want to know how a base model DC07 differs from the DC14. I couldn't see any differences in the specifications when I perused the Dyson website.

The reason I ask... Factory refurbished DC07s with warranty are for sale on eBay for $250--$270, lots of them. Example: Here (he's got 20 of 'em.)

Would I be nuts to go this route instead of spending $500-$600 for a new DC14?

tanstaafl.