It's simple, there's ASSLOADS of recommendations out there. Easiest way to pick what works, go to the RB26 dyno thread, compile a part list, work from there. That way you know what works and what doesn't.
As for your list...
[*]Oil mods like which catch can, relocator and oil cooler - JJR Autech catchcans are the trick, simple, cheap, easy
[*]Front pipes (No I'm not going to AM Performance) - If you're not going to listen to heaps of people recommending you see Andrew, I won't answer this, he is cheap, does quality work and his service is second to none
[*]Pods or panel filters - Standard air box is good for 400atw, it also lets a shitload more cold air in through the air guide, do the math
[*]clutch, ebc, injectors, cams, fuel pumps - Clutch; a nice twin is my opinion but that's personal preference. EBC; anything like the Profec B or the Blitz SBC. Injectors; 700cc Sards, straight drop in, easy as (although not needed if keeping standard tubos). Cams; not needed. Fuel pump; I prefer the Nismo for straight drop in but you can get by with an 044 or 040 Bosch
There you have it, a nice, easy, reliable part list.