Before making any comments, I would first like to congratulate you and your wife for doing very well financially. Much much better than the average couple of your age group.
Now, my views. What are your objectives and goals for wanting to achieve all these financial goals? Do you want to work all the way for the bank to pay off the mortgages for 30 years (28+30 = 58 years old)? Then eventually retire, with no kids, plenty and plenty of cash... to give to who? Give your nephews and nieces if any? Your siblings if any? Or more respectably, give to charity?
And also, comparatively, poor me only bought a 5-rm flat, and while it will likely depreciate over time, current paper gain is $225k over a $325k property with $140k loan still (means outlay was even lower), with more malls/facilities being built beside still. The extra cash are parked in stocks, bonds and fixed deposits/cash, generating more cash too. So $180k gain over $700k outlay is... ok ok la. Not too bad still, with ah gong still giving rebates for HDB dwellers.
Ok now for the most positive/optimistic future:
Help boost the birth rate of Singapore! That's where you could park your cash

, in your kids!
-- This is coming from a person who really like kids