Your situation sounds not dissimilar to mine....High income $200k+; good servicibility record, other income producing assets etc. I bought a PPOR on an interest only loan 18 months ago . My rationale for going down this route was that , because the property will one day be an IP, I wanted as much borrowings on this property as possible and to maximise what I could put in my offset account until such time as I bought a more permanant PPOR.
However my bank , Westpac, would not lend more than 80% without either LMI or by quarantining part of my savings into a term deposit and using that as security for any shortfall above 80%. Obviosuly the latter option would mean the interest payable would be less competitive than the offset account interest credit and give rise to increased taxable income while the former option meant steep LMI, so I paid the 20% deposit and avoided the LMI at the expense of the loss of a future tax benefit. I think that was the most sensible option.
Seems the banks will go higher than 80% LVR again