There aren't very many hills in my part of the city so I am tempted to build a steel frame bike with a single crank and an internally geared hub. Leaning away from a fixie just in case, plus I am not in very good physical shape currently... Would really like to use the Shimano Alfine 8spd. Can anyone suggest a frame that will fit that rear hub? I know I need 135mm backspacing but most road frames I have seen are 120-130mm. I don't want to spend more than $500 and looking for something that is lightweight. Also would prefer something with a straight blade steel or carbon fork.