tony, you already know about that KTM being built with the 650 twin. that looks promising.
i'm leaning toward a ninja in rally trim. just got a new (to me) 07 with 500 miles to tear into. man, these things can be found really cheap. with the weight of the engine as a given, it is really hard to do much better than you did at around 400#. the streetbike crowd has trouble getting this bike below 375 with carbon fiber parts. usd forks add weight, as does more fuel capacity, etc. mine will end up over 400, hopefully not too piggy.