finallly there's another person alike me
I have the same taste too,...6.5 rom with 2.1 manila :
the key is : SSK kitchen 3.2.1 !
you would cook 6.5 rom with either htc black or original oem manila...then you would get a perfectly fast/smooth running 6.5 with 2.1 manila rom .
I love it ! even tomtom works on this 6.5 rom without lags.