I think it'd be hard to find a new bike that fits just like an old one. I mean, aside from Harleys, it seems most new bikes are so much lighter than our old relics. My 98 Suoerhawk weighed similar to my 550, and with 450 more cc's displacement and 50 more horsepower! And bodywork too! I think the Bonnies and Scramblers may be to your liking, as was previously mentioned. Something more in the adventure bike arena, like the Buell Ulysses, Suzuki V-Strom or the Ducati Multistrada may fit as well. Other strictly road oriented bikes that you may like could be the Suzuki Bandit or the grandson of the CB750, the Honda Nighthawk 750.
They may not fit just like the old CBs, but they're all upright bikes with pegs basically underneath you. Definitely not foward controls.
Jeff