The MST MS01D RTR is better than alot of higher end kits. The only thing I really don't like about it is the stock steering servo. Other than that you get pretty much every thing you want in a drift car:
-high angle steering
-front one way
-oil filled shocks
-genuine Tamiya(!!!) body
Just make sure you get the version 2 which comes with CF upper decks and some other minor extras. It's roughly the same price as the Sprint 2 RTR but is a much better drift car.
MST MS-01D RTR
I would stay away from the Vaterra unless what you're really after is just a TC basher.
The Sprint 2 and E10 are actually good beginner-level drifters but are very limited when it comes to upgrading the chassis. If you find yourself suddenly hardcore intro drifting you'll definitely want to upgrade the crap out of your chassis.
The MS01 RTR is based off the regular MS-01D, which is one of the better belt driven cars on the market and all parts are 100% intherchangable. The parts I listed for the car are either discontinued, rare, or not available for either the Sprint or the E10.
That said, I have so much fun drifting E10's that have the FOW and spool. The car is very tough and you don't feel uneasy driving on dusty surfaces as much. But, for as much as you spend on upgrading your E10 with some necessities, you should've just went with the MS RTR in the beginning.
RC drifting is more than just putting on hard tires and powersliding.