Domain related question.

I found a keyword phrase that has a high number of monthly hits and a low amount of competition. Unfortunately, the domain name that matches that phrase is already taken. But there is a domain available, that's the same phrase but with the letter "a" before it. So if XXX was the keyword phrase, the domain would be www.aXXX.com.
My question is this. Does that "a" make a big difference in the SEO value of the domain for that phrase?
The "a" actually flows its the phrase quite well. I just…
Domain related question.

See original post by Xeronations