As a budget drifter depending on how small your budget is at the least get an LSD. (Limited Slip Differential) a 1.5 or 2 way should do the job. You'll need to stiffen up the suspension so a set of second hand coilovers would do the job. 4 stud is fine but choice of rims can be a bit limited. Axles shouldn't be a concern. A decent clutch wouldn't go astray either for all the clutch kicking you'll be doing. There isn't much else you could do without spending lots of money. Feel free to correct me anyone as i'm only a novice but keen drifter as well.
Cheers