For geo, try to keep consistent notes throughout the year as it can be quite content-heavy. You'll have to do a SGP (Senior Geography Project) which is research based and is a lot of work (mine was ~50 pages) - plan ahead if you can. Make sure you know all your mapping skills because those are...
Personally I like the economist for up to date info and it actually tends to have quite a lot of relevant info.
The Riley is indeed out and I got a copy from Five Senses online, or you can buy it directly from Riley on his site. So much better than Dixon.
Domestic market operations - mainly how the RBA buys and sells gov't securities to influence the cash rate.
Selling securities reduces the about of money in bank's exchange settlement accounts, and the cash rate increases as a result of increased demand in the overnight money market...
There isn't really an opposing argument that is substantial AFAIK - dumping pretty much screws the domestic market over.
It does benefit consumers in the short term but the lower prices will drive domestic producers out of business so in the long run, consumers will lose out too.
Forgive me if...
Re: "Can I get a decent ATAR with these subjects?"
I think you need to consider whether you want those 2 'spare' units from Music 1 as a bit of a safeguard. I actually started the HSC year doing 14 units (Maths Ex 2, Adv English, Phys, Chem, Eco, Geo) but dropped chem pretty much immediately...