I did an approximate calculation and it seems you and your spouse are the rare breed developers are looking for.
It's a curious thing how you managed to hold through all those years while the income floated out of HDB affordability. Still possible to but the step is complicated.
Based on what you have provided, if no other loans or guarantorship or credit debts, you can almost get a 2 million property.
Regarding what is worthy or should you max out the credit, that is very arbitrary. Things like how many children, whether you want to consider the option of staying with parents, when you plan to have, whether you can live with parents, whether you want to treat it as a home etc.
For your preference to stay in suburb region, your options are wide open. Take time to think about your future in 40s and 50s.
The three laws of Kelonguni:
Where there is kelong, there is guni.
No kelong no guni.
More kelong = more guni.