In the event your handles do start to look a little grimy, you can also try going over them with a Mr. Clean Magic Eraser. Some other members here have had success with that.
My Speedy 25 is probably 12 years old (it was my first LV purchase) and it's still in relatively good shape and I still carry it from time to time. I think it's a great purchase!
Oh, the Speedy 30 is the classic LV bag. It's the bag that started my obsession! I agree with all the comments. Dark handles are usually from dirt. If you do minimal maintenance, you'll have the bag forever.
If you take care of any bag it will stay clean. This was said elsewhere but make sure you don't pick up your bag after you've put lotion on your hands. It causes an uneven patina. Not black but the leather will darken quicker.