I've got it but only played a small portion. I'd say stick with what you've got.

 I too am a huge fan of the original, I bought the iphone version of the directors cut while I was on holidays, and had many hours of busses and planes ahead of me. I have to say, I'm quite satisfied with it, the interface is slightly dumbed down to be functional on a touch screen device, but the extra content is quite good. They have esentually gone in and added all these extra chapters in between and during the events of the original game, ever wandered what Nico was doing while George was in Ireland? Well now you can play it. A few things have been altered and streamlined, George seemed to have a much colder and self centered response to the Cafe blowing up in his face, but I'd day a good 90% of it is how you remember.    The extra content definately adds to the experience, I'd say give the Wii version a shot.