most brand name oil products are not very different from each other. you can also consider using synthetic oil but keep in mind the cost involved.
in my opinion, you can get better performance by simply doing a basic tune-up (plugs, plug wires, distributor & rotor, higher gauge grounding kit). get regular plugs and dont get platinum or sh*t like that cuz u dont need it.
also consider getting a new air filter (u should have it changed at 12000KM anyway plus a new fuel filter)
people here will tell you go get platinum cuz it sounds cool. technically...platinum tipped plugs are useless you have a high performance engine.