The 70% equities, 20% property and 10% interest bearing is the classic split. But yes, I suppose 10% dividends would make it 80% equities. But there's certainly nothing wrong with 80% equities!
I'm torn between STX40 and SMART. I really like a 50/50 split between these two.
PTXTEN is now merging with PTXSPY to create a new ETF (tentatively coming into effect from end July 2019). The new one is pretty much the same index as the Satrix STXPRO. Coreshares has promised to lower the relatively high TER with the merge (probably to compete with STXPRO). But you may as well flip a coin here between PTXTEN or STXPRO or watch the TERs once the new Coreshares ETF has settled in.
For the dividend ETF, both DIVTRX and STXDIV are decent choices. DIVTRX targets more consistent yields in the longer term whereas STXDIV targets higher yields in the shorter term. And then again, although STXQUA is not strictly a dividend ETF, it's dividends are usually excellent.
In my opinion, STXEMG has the most long term potential (although high risk), possibly even more so than tech shares. If you have a bit of appetite for risk, why not do 10% STXEMG, and then leave the ASHGEQ and go for STXWDM and/or S&P500.
GLODIV has been doing really well lately and is likely to continue. Not so great in a TFIA though as the unpleasantly high foreign withholding tax on dividends negates a large chunk of the tax benefits though, but it still does have excellent capital gains, so maybe still even worth having in a TFIA.
I personally like having a bit of a mix in my ETF portfolio. If I were you, I'd mix it up a little and make it a bit more exciting.
What about something like:
Local equities: 20% STX40 and 20% SMART
Local property: 20% PTXTEN
Emerging markets: 10% STXEMG
Offshore: 15% CSP500 and 15% STXWDM (or alternatively 10% CSP500, 10% STXWDM and 10% GLODIV)
Or if you don't like STXEMG but prefer slightly less emerging markets exposure, but still want some:
Local equities: 20% STX40 and 20% SMART
Local property: 20% PTXTEN
Local dividends: 10% DIVTRX
Offshore: 30% ASHGEQ