To be quite honest, ANY of those would be a great choice (with the exception of the D3). As much as I like the D3, I probably will never get one, based solely on it's overcomplication. It has too many belts, the belt adjustment feature is too complicated and difficult to adjust, it also doesn't come with the requisite parts to make it complete, and it's balance is waaaay off.

The Sakura XI is the popular chassis right now, and places like TQRC Racing (where I go for almost all my parts) are stocking tons of parts for it.

The TA05 is one of Tamiya's longest running models, and any TA05 model will be good. There are a few carbon chassis kits available for just about all TA05 models, and the TA05 is one of the best all-around chassis for drift and grip driving.

The TA06 departs from the TA05 series, and there's not much from a TA05 that will fit a TA06, apart from some suspension parts, but the TA06 is perfectly balanced, right from the start, and requires the fewest option parts to make it competitive. As a drifter, it requires only a spool for the rear, front one-way for the front, but has an issue with motor fitment - some BL motors will not fit it, based on it's rather small motor bay. Brushed motors will all fit, but it also restricts gearing choices, as well, but if you use it for drift, that little problem won't be an issue, since lower gearing is what should be used, anyway.
The TA06 also now has two or three carbon chassis kits available for it. I have the RSector kit, and it's probably the best of the lot.

The above choices (with the exception of the D3) are all interchangeable from drift to grip and back again, by swapping a few parts, and are all able to be CS'ed like the D3, when you are comfortable enough to try it. Modding for CS will take some study, as belts and pulleys need to be replaced with suitable sizes to accomplish CS, but to do so doesn't take much more than that, so any of them will grow with you, since belts and pulleys are all pretty much standardized, and Tamiya themselves, make pulleys and belts from other models, that will do the job. 3Racing also does, so the XI can be CS'ed, as well.