My best advice to you, and anyone else thinking of getting into drifting is to read this entire thread. A TON of great info from experienced drivers.
http://jdmchicago.com/forums/showthread.php?t=26215
Also, stick to simplicity. An SR is all you need power wise.
Focus on:
A quality set of coils, new or used
Bucket Seat
Steering wheel
Welded diff.
A working E-brake. No hydro.
The more reliable your car is, the more seat time you'll get.
Please don't think of an LS, 1/2JZ, or RB swaps. If you do not have the experience/skills, these setups will only hinder your learning.
Hopefully this helps!