I'm planning to Buy a few rc's in bunch(i mean only 2 ).
I have planned for the Traxxas E-Revo 2.0 and other a On-Road Drift car.
I don't know much about On-Road RC Drift Cars.
Please Help me out!
P.S: Budget ain't a matter. I need a Electric Brushless System.

First decide if you want to build one or buy one and give it a try without any build or setup.

Also other decision include availability, upgrades etc...

Since you mentioned money aint no problem, I'd suggest the professional stuff.

My personnel suggestion for the most realistic drift is MST RMX S 2.0 RTR or FXX RTR. You can buy them learn well and then maybe upgrade to a VIP setup later on

Caution : 2WD drifting can take sometime for anyone to perfect... So if perfection is what you are behind, go for this. Happy drifting buddy

http://www.rc-mst.com/product.php

Always built one rather than buying RTR
.
if the budget doesn't matter I would suggest the Dlike Hybrid RER which is a beast out of the box.
A middle range will account for MST, Sakura D4, Eagle racing or Yokomo YD.