How heavy do you want your Scrambler? The NP205 weighs in around 180lbs (if not more), if I remember correctly, where the D300 weighs in around 85lbs. Also, the gearing for the 205 is 1.96:1, 2.62:1 for the D300. The Lomax gears for the 205 (it replaces the case as well) are around $1300 to get it to 3:1, compared to around $550 for the D300 and going to 4:1. The d300 will handle the power of the 305, and of course the np205 will laugh at it. Personally, I would probably spend the $$$ on the adapter and suck it up and go with the D300. But, you really can't go wrong with either option.