Hmm... Trust me, you're going to want opinions. Plus, if you're asking people to tell you, they have to say their opinions. Saying anything about the cars will be an opinion. There is no clear "Best" chassis since people have different styles and preferences. The only facts you can really get is what parts are available, and the prices.
The E10 right now is the most affordable drifter. (Fact) You can get an RTR kit
For 170. That's truly RTR, minus 8 AA batteries.
If you are going to Drift, that chassis was specifically made to drift. I am pretty sure this is one of the few, if not only chassis designed to drift. There are drift spec chassis kits, but they are more expensive and are touring cars with upgrades to try to get it to drift. The E10 setup I hear, and by most of the posts I've seen and on this thread, is really well done.
I personally use a TT01, and love it. Locking the rear diff is not always necessary and depends on your drifting style. This is stuff you need to experiment with. However, it will be more expensive to get a TT01 running, which prior to the E10 ,was the cheapest setup to drift. Again, this chassis was designed for touring, not racing--so out of the box it will be harder to drift.
Oh btw, ABS tires are the standard now. You can buy 2" tubing and cut to 26mm (the width of a rim) and put it on your rims. But if you're busy, I would suggest ordering them online. Ebay in particular has stores that sell pre made AND routed edges that make it smooth. Sushi Drift Tires go for around 10 shipped for 12 tires (3 sets).