IMO any semi or fully synthetic oil of either a 5w-30 or 10w-40 or there abouts, will be more than up to the job for our cars driven daily when being oil changed every 5000kms. Im going to run a 10w-40 in mine as I dont see the point of over thinking the oil for a daily driven car with stock or mildly modified engines.
In my 180sx I run oil at no more than $50 a bottle, I always buy a few bottles when its on special so probably getting a $60-70 bottle for that price. The engine is fine even after a few drift track days and its making 270rwkw and revs to 7700rpm. Ive tried Castrol Edge, Motul turbo light, Shell Helix and Nulon. The Nulon I wouldnt run again as the engine did sound a little louder in the top end.
Just change it every 5000kms as you should in turbo cars.
Oh, and dont forget changing the filter at the same time!