Hi Compleks
I've only just started with ETFs. But can try and summarise what i have read and have based my decisions based on the following:
1) diversify across 5-7 funds (maybe your 4 will do? not sure)
2) for an example of ETF-based portfolio, have a look at Glebe's alternative (see dkmc's rejigging portfolio thread). I like the thread coz it has a lot of great discussion building up to the portfolio - so you can discern the reasons and issues to be considered when making up yours. The portfolio that i have built is based on this. I have altered the percent's to match my preference and circumstance.
3) the recent 'dip' in the markets proved to be a dip across the board. ie, don't count on getting negative correlation from international shares or LPTs. I think dkmc had direct residential property in his portfolio and this has been the only asset class to go against the dip... the other could be commodities?!
One thing: have you considered index funds? for regular small purchases, they may be more cost effective.
The other thing: someone else here will probably bring it up if i don't  get some pro advice from a fee-based financial planner. I did - and while it didn't add a great deal to my ideas - it helped re-affirmed them. If nothing, an FP will help you consider other issues that you may have missed out - insurance, tax, accounting structures, etc.
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