So was browsing ebay, and an Aluminium (lightweight) pulley was on sale for the Celica. Snagged it and did my research [was worrying about harmonic balancer as every other thread ranted about it - but then clarified difference between alternator vs crankshaft pulley].
In the end decided it wasn't a bad idea to purchase as it only costed $20 - and was OEM size, just lighhtweight.
The only issue I am forseeing is my current sound system is an 200W in-built amp SUB with my Kenwood deck. Can't see this drawing too much power, but if I do notice electrical power dips (headlights + power window etc) - will a grounding kit solve my problem? Or battery capacitors as well?.
Or will I need to look into bigger batteries?