Recommended liquids

[Evozn]

After a little scare of my car running out of brake fluid, it had me thinking, I should change all the liquids. So far this is what I've done.

Engine oil - Penrite 10W-30 Everyday.
Power steering - Sucked the old stuff out with a syringe and refilled with Castrol power steering fluid, the little tiny ones.
Brakes - When I found I had no fluid I topped it with Valvoline 3 dot but the next day my whole system got flushed anyway.

Now the ones I need help with;

Coolant - I was about to buy some green Penrite but they only had one bottle, Supercheap website recommends blue Nulon and I'm reading different information everywhere.
The next two, should I let a pro do it or let it be a DIY job.
Transmission oil - Not sure what to use, dot. Would I need to change the filter too? If I diy it, would I have to worry about what's swimming about at the bottom of the torque converter?
Diff - Not sure again, could I use the same oil on all the diffs?

What would you guys recommend?

Thanks.

[J0HNATH0N]

http://www.datateck.com.au/Lube/PenriteAus/

diff oils and trans are good. eng oils are reccomended from 'new' but 10w 30 is perfectly fine with 50,000--100,000kms. i went with the full synthetic trans fluid and pro gear 75w90 diff oil

[Evozn]

Okay, cool. Transmission and Diff are set, final one is coolant, Nulon Green/Red/Blue concentrate? Yes? No? I was thinking of picking up a blue bottle while they're on sale. And, mixing ratio for it, I was thinking of doing the full 5L and topping up the rest with demineralised water, so 5L coolant and 1.8L of d/m water.