I've had this combo in a KDT since 2008, wearing it only in summertime. It still looks good, not dirty at all and I haven't babied it. Congrats on a very pretty cuff!
I really like mine--I would keep it. I wore it a handful of times this Summer and while I do tend to baby my items, it looks as though it is brand new. I wouldn't be too concerned about the white getting dirty.
Keep it, I've got one coming exactly like yours!! I have the KD in PHW and it wears well, the Epson can be cleaned easier than the swift. It wears pretty well too!