NISR20MO

To make a solid, DD friendly, 240 that you can have fun sliding in you don't need much.

First lets start with the basics:
Good suspension (stock is fine)
Tires with tread
Clutch that holds
Welded diff (perfectly fine for DD use if you can wrap your head around how to drive with one)

That is pretty much it honestly, adding more parts from there usually only increases the ease of drifting and the amount of angle you can use.

Once you get good on the stock stuff or break shit upgrade. The only time I found myself needing more angle was after I added coils to my stock everything and a welded diff setup. I didn't "need it" but I could certainly "use it" as I was sliding around obstacles with my steering angle maxed out the whole time...

For cheap angle just buy two 7mm spacers from PBM to use on stock style inner tie rods. If you really want to you can buy a maverick motorsports angle spacer but you may also need z32 inner tie rods like I did...

Good mods for improving feel:
S13 solid steering column bushing
S13/S14 solid steering rack bushings
Drift button
Tighten EBrake cable
Stiffer trans and engine mounts
HD clutch
Coilovers and arms as needed
Subframe/Diff bushings

For maintenance and upkeep Rockauto.com - This place is awesome especially if you know what you are looking for, skip enjuku for maintenance and light upgrades and you can get twice as much for your money.

Some examples of common necessary maintenance items:

FRONT BALLJOINTS:
S13: Rockauto.com moog front lower control arms ~40 each (why struggle with a balljoint when you can replace the whole arm and get an extra new bushing too)
S14: Rockauto.com Moog balljoints ~$30 per piece or Partstrain.com has full front lower control arms but they are ~$150 each and at that point you can get GKtech's newest FLCA's which come in stock or extended length, they should be awesome upgrades for the money)

TIE RODS: (**note** the S13 uses a different finer thread pitch than all other nissans so use S14 outers if you are changing the inners to something else)
Moog Inners and Raybestos Outers ~$20 per piece (I prefer raybestos outers as they come pre-greased unlike moog, I use maxima inners for extra length, you may want Z32 inners if you are adding a steering rack angle spacer<< I prefer maverick motorsports' version as good bang for the buck)

BRAKES:
Centric/Stoptech Street Performance pads ~$35 a set (comparable to hawk hps but at half price)
Centric/Stoptech Stainless braided lines ~$35 a pair (cheap and good quality)
Centric Premium rotors ~$20 a piece (black hat coating so they don't look rusty and super nice double disc ground finish for bedding in pads easily)

CHEAP ANGLE SET UP FOR PEOPLE WITH A FEW HUNDRED $'s
PBM forged knuckles
GKtech extended LCA's
Tension rods
Maxima inner tie rods and S14 outers