Need Advice: XBOX 360 just RRoD'd for the 2nd time.

I bought the console from GameStopabout 2 years ago, and it RRoD'd in about 6 months. I went to a guy I found on Craigslist who repaired it using a process he called "reflow". The system worked fine until about 2 weeks ago, when it RRoD'd again. At this point, should I bother refurbishing it again, or should I break down and buy a new one?