New Domain VS Trying to Rank Existing Site

Say you own an established site for a decently competitive set of keywords in a lucrative niche.

After a few months, you find an awesome Keyword (not longtail) you and your competitors seem to be overlooking completely, plus a set longtails related to that particular keyword.

So in order to take on this keyword would you...


buy a new domain and establish a twin site for the new Keyword? (also consider that EMD .com, .net, .org is not available for new keyword)

OR

Alter the Existing Site in Order to Rank for the New Keyword? (knowing your competitors will follow you, if they're not dumb)

Make a new page for the keyword on the existing domain, optimise the on page SEO to the max and then get some quality links to that page is what I would do.

I would agree with himpy!!!

i generally feel u should use existing domain and target the traffic with good onpage and offpage optimization

I agree with DX- Generation

Both and point the new one to ur site.