I know exactly what you are saying TC3, I ran my Ofna MBX conversion off 14 cells NiMh for quite some time and now that I have my 4s Zippy-R 4800 it is pretty much a different animal.
But as far as which batts are better. I went through this too before I bought the zippy the only thing that convinced me to go with the zippy is the numbers. Well and the Eagle tree data that Finnster supplied earlier.
And check this out... they have them in stock and you know you can't beat that price.
http://www.hobbycity.com/hobbycity/s...0C_Lipoly_Pack You can pick me up one for the suggestion.