There's a HSBC on Grenfell St in Adelaide City centre. Unfortunatly its the only one in SA (apparently just 8 in the whole Aus). As we use our account via the internet, it doesn't worry me that there's not one on every corner. I also joined Adelaide Bank and AnZ when I moved here, which was easy to do, but I guess because we were with HSBC in the U.K, it just felt natural to set up the account with them before we came out.
BUT I must admit, hearing more about Westpak from friends, its seems a lot easier with them. With HSBC there were a few forms and it became a bit tedious ( this was 2 years ago). Now you can apply online (not sure if HSBC do that) seems better all round.
HSBC charges 20UKP for tranfers over 10,000 (under this amount is 9UKP) not done this for awhile so charges might have changed.
I found HIFX quick, easy and simple and within 12 to 24 hours the money was in the account.