How about Elaphe carinata, the King Rat Snake? They get pretty big (6-8') but stay nice and slender. I don't know if they come in albino but their normal coloration of black and yellow speckles is very pretty. I've always heard they are a very interesting species to keep.
Not my photos so here's links:
http://farm4.static.flickr.com/3209/...f251e6d3fb.jpg
http://i286.photobucket.com/albums/l...e/c1d08b2f.jpg