Just go for EC..make the capital gains.if you do not like it (eg location)...can downgrade easily to resale HDB in a location that you want 5 years later..
Was thinking from this angle as well just that upon reflecting , most of my activities are around e city fringe, from work, to kids school. Anyways I summarise into 2 options. It seems that putting my extra funds into an index fund may not be a bad idea as well. Then fr my final move downgrade from prime 5 room to 4 room may be ok considering the kids may be moving out. At least can still host dinners for family n friends n enjoy subsidised n grants during retirement.
Option 1
Move to EC
Top up 600k from sale of HDB to EC
Possibly unlock 2.5-3 mil, 20-25 yrs time retirement move to 2 RM bto.
*Honestly not keen on my final move in the 2 room bto. Likely have to pay 1.5 mil to stay in a 3 or 4 room in a desirable area. I would have no more bto chances upon my move to EC.
Option 2
Stay in the 5 room HDB
Put 600k in S&P 500
Retirment unlock s&p- based on average 6% yield, amount based on the initial 600k would be somewhere like 2-3 mil.
Retirement , use last bto chance for 4 room, prime bto. Will likely profit about 500k from the 5 room still on top of fully redeeming the 4 room.
Then if die, Children sell the 4 room, profit possibly 1.5 mil. Taking about 30-40 years later.
Seems option 2 may offer the same profits whilst giving me a higher standard of living esp in retirement.
Downside is of course I will lose out on the amenities I could have got from the EC.