hi muhaha,
At this stage of the cycle, depends on how much money you are wanting to put away in your term deposits. Do you want to lock up money for a while? Are you dependent on the income for paying a pension? Do you want at-call, or 24 hr, access?
With the 90 day BBSW around 6.35% it is going to be very hard to beat this return for a 'no worries' deposit. Rabobank will do 6.6% at call for SMSFs (that's what they told me on the phone) but you are right that most of the others (ING and the big 4) expect SMSFs to be in with Corporate side of things and aren't offering as good a deal as for retail clients.
http://www.fixedincome.com.au/ is a broker (FIIG Securities) and they deal in larger amounts - wholesale. They have credit union TDs and a product called Diverseport which is 90% investment grade and the rest is Hybrid securities that can add a few points to the return.
Another way of getting a good return is buying investment grade Hybrid Securities on market. the recent Perls IV raising from Comm bank is paying a good return if the franking credits are taken into account
As with everything, risk is roughly in relation with reward. The folly of the Fincorps et al is there for all to see.
Not advice, DYOR