Dyson no longer manufactures the V7 Motorhead.
Dyson has begun re-selling the Dyson V8, but we are currently not recommending the Dyson V8 as it is overpriced for its capability.
The prices of the available Dyson cordless stick vacuums vary quite a bit as retailers maximize what they can charge for newer as well as older units.
Review the dimensions, color and other physical and visible characteristics of the stick vacuum.
If the stick vacuum is cord-less (or corded) and if so what it's run and recharge times are.
Additonal cleaning characterstics of the stick vacuum including its filter, cyclonic action and if it is rated for use in homes with pets.
Nozzles, cleaning heads, brushes and other accessories included with the stick vacuum.
The surfaces the vacuum cleaner is capable of cleaning.
The manufacturer warranty and certifications for the vacuum.