Heya,
Since we're talking strat's (yay!) and mods here's a decent article on strat tone: 
#26802
Local places to look for parts:
http://www.terryd.co.za - cheaper import parts. Useful for pickguards/plates, screws, pots, etc
http://www.raru.co.za - They're doing allparts imports and other bits - can be really useful if you can't get to a store.
http://www.blackbeardsden.co.za - Aside from kit guitars, there's a mix of cheaper and intermediate parts.
Facebook group: SAMIS and Revolution often have bits up for sale
Otherwise, T.O.M.S and Music Connection in JHB are always worth a visit.
