Yep I was gonna say that google understand plurals (so they say). Id buy the plural one because a search for the singular will still match your domain.
Id also wait until you know whether the site will work or not before going crazy and buying them all up. Domain name is only one factor in a large puzzle, at the end of the day your rank and ultimate success will largely depend on relevant backlinks etc.
The downside of multiple domains is all your backlinks could be split or Goog will see them as duplicate content and sometimes one will rank and not the other and it gets messy. Although nothing that would be the end of the world...
I ended up wasting so much on domain names (after that lightbulb moment) that I ended up buying a couple of generic addresses and now I prefer to subdomain. eg widgets.website.com or morewidgets.website.com
Obviously the key is getting something nice and generic that wont put people off (no one will want to go to widgets.qsd7d.com!). I find sites rank just fine like this. Your keywords get bolded nicely and stand out well. Get a nice short easy going friendly "brandable" domain and I reckon most people wont even notice. Nice if you like throwing up lots of experimental sites around single widgets! Who knows get a few successes and the domain may build into a brand itself! It then becomes an attractor not a repellant!
Note that goog treats them as separate sites so they dont share "link juice" and another point to note is they wont show lots of links from different subdomains on 1 search results page (they make exceptions for ebay, etc).
Anyways GL!
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. Your keywords get bolded nicely and stand out well. Get a nice short easy going friendly "brandable" domain and I reckon most people wont even notice. Nice if you like throwing up lots of experimental sites around single widgets! Who knows get a few successes and the domain may build into a brand itself! It then becomes an attractor not a repellant! 

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