I have owned a BEO 2009 500ie for three years, and find it great for both city traffic, and high-speed highway riding. You won't be sorry. And a 250 surely seems too little for highway use.
Also, seriously consider CDwise' comment about the Aprilia Mana. It's an 850cc automatic, with a following just as enthusiastic as the BEO riders. 2009 models are on sale, if there are any left. Aprilia has also rebranded another bike with the same drive-train (Gilera) as an Aprilia maxi-scooter. I really enjoy the BEO, although the Mana is my next bike.