I would get the C, I have a 2008 1200 C and love it! With the C you still get the 4.5 gal tank, but you get forward controls, you get that sweet looking riser/speedo combo, more chrome, the chrome rear wheel and 21" laced front and I think the seat might be differant, but not sure on that one. The C has 11.75" rear shocks so it's not like it sits high at all-same shocks my XL50 has on it and HD call that bike lowerd in the rear LOL! I just think the C is lot better looking and more bang for the buck over the 1200 low.
This is sort of like Cold Case Files, bringing the dead back to life. I have a Low, but if it had not been for that riser on the Custom, I would have gone with the Custom. I love the Low though, and I'm glad I went with it.