Cougar, Mad Cat II, Mauler, Awesome, Raven and maybe Victor are options. YMMV on whether they need resculpt. These are just the ones with MW4, XTRO and TRO pics.
What i really want is a MW4 Mad Cat Mk II. None of the existing ones, the DA sculpt, the original nor the XTRO one quite look like MW4 version of Mad Cat IV...