pro and contra of E-Glide,Tour Glide, street glide, road glide

hello. a buddies wants to get a big tourer. he had driven shovel up to now and wants something like that in the excavator style. now the question-which model. best föllt him the variant with double headlights, so road glide or so!! can someone tell me the exact differences of the different types ? frames before and after- and where are the most differences ? is no matter whether evo or twincam, for a new one is not enough but the money!! street glide I like on the b esten, but is expensive there still too new !! but in the net you will find sooo many different models e-glide,tour-glide,road-glide,street glöide u.s.w….. what to take???, so that the decision is facilitated ??? hope for clarification and tips !! thank you in advance