There is alot more than just shock/spring setup for drifting. Buy new polyuerathane (sp?) bushings (i.e. subframe, control arm, etc.), if you are looking for a cheap solution to eliminate wheel hop and tense up your rear end (many have said one of the best mods they have done) get subframe spacers (or just buy washers from home depot, ace hardware). Wheel choice and tires will also have a dramatic effect on the way that you 'drift' (hopefully you are not talking about fishtailing then I am wasting my time). Stiffen up your car (as you MUST have it) with front and rear swaybars, many recommend whiteline (actually they are a soft blue, go figure) swaybars and strutbars will get you there as they are adjustable, front and rear. That is all I can think of as of now, and remember to get an alignment.
Some Links to topics discussed:
http://www.pdm-racing.com/prod....htmlh ... od....html
P.S. I did not discuss in full detail a good drifting setup, nor cover all of the major components, just a hint.