The DB01 out classes the DF03 in every way.
Both will cost you a huge fortune to up grade.
The DF03MS is a well hoped up kit straight from the box
http://www.stellamodels.com.hk/84370...on-p-7688.html
And the DB01R (if you can find one) is the hoped up kit.
But you can get the DB01RR now.
http://www.ebay.com/itm/Tamiya-84369...-/331035477488