well... the eggplant will get the most $$, as its a very coveted color- but its also going to be very difficult to let go...
ink's the most recent color so it would be easiest to replace later. and there arent many khakis are floating about and the color is awesome, but you dont seem to be in LOVE, so maybe thats the best bet- but no guarantees on it fetching a high price- its not one of the most popular colors, but maybe thats just because it isnt common. (I think that of the 04s, lilac, rose, eggplant, seafoam and turquoise are probably the most popular, but not neccesarily the most rare)