So really, it's:
1 - Suspension
2 - Tires
3 - Sliders
4 - Bumpers
After that it'll probably be gears and lockers to run 35's.
If my truck were newer, I'd probably eliminate the suspension for a few years. Also, having a DCLB, I need the clearance as I've bottomed it out on stuff quite a few times.
That order isn't too far off from how I'd approach it. I do think lockers, especially rears, are a lot more relevant to realistic 4wd driving than most people realize, but that aside I agree that suspension and tires are usually they quickest and cheapest ways to see mild improvements over your stock 4wd capabilities (keeping in mind that your suspension setup is heavily dependent on how much weight you plan on putting into your rig).
Honestly op, drive your Tacoma in stock form for a bit and get a feel for what its good at and what it needs work at...then go from there. I've been telling myself for the past year or so that I need to add this mod or that to my 4runner. The fact is it has gotten me into, and out of, all the areas I like to go with little to no modifications. I'd have to drive 3-4 hours to find an area where I would legitimately need sliders and huge lift....so I've been very slow to add much to it.