I currently use NAB trade and also Saxo.
Saxo doesn't have all the small caps on the ASX but is great for overseas exchanges like Nasdaq, NYSE, TSE and also options, CFD trading.
haven't tried cmc or ig though.
Saxo have a minimum $3000 AUD to open an account but this can also be in shares.
they have a promo via referrals where referrer receives $350 and person who opens an account via the links gets $150... happy to send you a referral link if you like.
