Went to elaborate but was to late (my 30 minute editing period expired). Perhaps the moderator can remove my first reply.
Here we go again :
Before I forget, as it may come about that you'll eventually need to learn a bit about SEO, take a couple of days and read the search engine quality content guidelines for Yahoo, Google and MSN. I haven't their URLs handy but you should be able to easily find these. Read all this so that you get a fairly clear picture of what it is the search engines want to find in order to offer your web pages within their search engine results pages.
Now, just because you attained a high ranking for one keyphrase, one with a fairly low search frequency I might add but a good ROI keyphrase nevertheless, doesn't mean that you can do a little bit of a "lickity-split, abracadabra and presto" rank highly for just about any relatively similar keyphrase. No, it isn't as simple as that.
Indeed name your new web pages as you suggested "vaughan-computer-repair.htm" [Vaughan-computer-repair.htm may be somewhat better] etc. as logical naming conventions can help as a ranking factor (when using the hyphen as a separator) but the webpage intended to attract searchers for the Vaughan keyphrase cannot be a slight variation of the webpage you offer for the Toronto search. No, no, no, no, no, the content between the two needs to be uniquely developed, a one-of-a-kind, in order to maximize on satisfying some of the most important ranking criteria. The search engine wants to see something new and different for each web page you create (and an experienced, qualified Internet visitor that you attract will appreciate it too).
I wouldn't think it would take much more effort or innovativeness to rank highly for Vaughan or Brampton or Mississauga or Etobicoke than it did for Toronto; just create uniquely developed content for each and basically do with each new webpage what you did with the first one (probably Titles and Descriptions, some headings and decently written paragraphs.
Last edited by canadafred; May 25th, 2009 at 2:47 pm. Reason: caught some spelling mistakes