I have used many, many recorders over the years and Fraps is the only one I could possibly recommend for this application. Its not a coincidence so many people use it. Its the easiest to use and the best quality.
I would suggest if you can't run Fraps while in Blockland, its not about the software. Its about your hardware. You will be pressed to find a recorder that can output a lag free video to reasonable quality if Fraps lags you.
If you happen to, please do share. I'll eat my hat.