What URL structure should I opt for?

[giggity]

I am looking to write a detailed guide on product X. Which URL structure would be more suitable.

site.com/shopping/guides/mobiles/productX

or

site.com/shopping/guides/mobiles/how-to-save-money-buying-productX

or

site.com/how-to-save-money-buying-productX

Are any of these obviously better than the other?
Are any of them too long?

I am opting for the first one because it makes most sense to me but you guys may have other thoughts.

Thanks

[Paz]

I'd keep the URL as short as possible for your users (you don't need shopping and guide in the URL) so look for a structure like;
mobile-shopping-site.com/productX
or
mobile-review-site.com/productX

Then I would set up my site to be either a review or shopping site - I've never had any success doing both but the reviews have often done better when I've labelled them as comparison sites. In the niches I'm working in Google gives a strong preference for comparison sites.

Cheers,
Paz.

[JennifferGrey]

I think the 3rd one would be catchy. People nowadays prefer to buy something cheaper, as long as the product will satisfy them