Jesus dude, ride your KHS. You haven't even been riding long enough to know what you want besides from vague notion of "better" as well as "lighter". There's no such thing as "better" than your KHS, there's only frames offering different features, be that they're lighter, stiffer, more forgiving, more aerodynamic, more comfortable, more rare, more durable, better warrantied, more suited to your body fit, better for sprinting, better for high speed, better for low speed manuevering, longer wheelbase, shorter wheelbase, more classically styled, more modern looking, more reputable, more independent, more customized, more attention to construction, more value for your dollar, or something else.
The idea that you can just buy something "better" and also "lighter" as your main priorities for upgrading is pretty darn foolish. Ride your bike for a year, then you'd know what you want instead of wasting your money. Other than not being light enough (a stupid criteria for measuring the suitability of a 20 pound build) what exactly is "less good" about your KHS that another bike would satisfy? What qualities are you unhappy with other than it's "not better"ness?