I enjoy games that have a solid plot and engaging characters. Group makeup is important but not as important as group dynamic. I personally play spellcasters more often than not and enjoy some of the more creative roleplaying outlets like spell research, item creation and unual spell composition.
I started playing D&D during the AD&D days and have played all releases since with the exception of 4th. I have not played since I was graduated from college 3 years ago, but I miss the game and doubt it would take me long to reaclimate myself. I have a rather large set of reference materials from the versions I have played over the years and am not opposed to purchasing the new edition materials.