Ok, I can see how you'd want to be different. Correct me if I'm wrong, but Trial never made S13/180sx aero parts. As for complementing the Trial front, I think the C-West side skirts and rear compliment the front very well. Notice how it has the "swooping" design that's on the Trial version. (compared w. the straight edge design of the Vertex)...
Now, onto some more options:
Do-luck S15 front, and then maybe using the 180sx (240sx) side and rear:
Garage Defend S15 front, and the Garage Defend 180sx side / rear:(not a good pic of the side and rear though, lol)
Impul S15 front, and another side / rear (Impul doesn't make S13 parts):
If you like the ings S15 front, here's a pic of the sides and rear for a 180sx:
I think if I ever went the S15 Sil-80 look, I'd probably go with the Garage Defend setup. To me, it's the most appealing...

But either the Border, Impul, or Garage Defend fronts would all set you apart from the crowd of S15 conversions.