I've read that driving a car is extremely expensive. Is there anything that's cheap in Singapore. Make sure that both of you are ok with the move, as it's very difficult when the partner is not happy. My guess is, that you will miss the availability of products here when you move away from Singapore and not the other way around. Taxes - I think you are required to pay income taxes here, but coming from Germany that would only be beneficial to you.
Income tax is much lower.
I know a few people here where the company also pays for the telephone connection and airconditioning costs - if the airconditioning runs day and night it can be quite expensive. We use fans, not because of the finances, but because we like it much better than living in a fridge. How about home leave tickets - normally they provide one a year. Cars are very expensive, but taxis are very cheap compared to Europe.