My vote goes to the 35 Rem, 7X57 & 260 Rem, as well. I also second Quick's suggestion of longer barrels for the .270 & .30-06. Expand the Ultra line to include more calibers. Perhaps all of them. First on my list would be an Ultra .280. Seems I've read somewhere that there used to be one offered, but it was discontinued. How about an Ultra 7mm-08? Or perhaps a .35 Whelen?
My personal choice for Handi calibers would be the .303 British and 7.62X54R. I doubt either have much of a chance, especially given the disappointment of the 7.62X39 not being recommended for using surplus ammo. I would hold out hope, though, that there are more reloaders loading the .303 than either of the Russian cartridges. Factory .303 ammo is available just about anywhere ammo is sold, with the exception of the "Mart" stores.
EVOC ONE