Firstly for new purchase property, better to get loan from the end financial for the developer, as the process will faster.
Can let us know which back is their end financial bank? If the bank offer not not so good or not your fav bank, get more offer from others.
CIMB,HongLeong,Alliance offer good in flexi loan,
PB,OCBE offer good in term loan
But it's also apply to their T&C.
If you need help i can help you to get offer from few bank and compare for you. free of charge

Actually you can easily download those mortgage calculater on internet to get the installment illustration.
Or you can pm my you email i can send one for you too

thanks for the reply..
and i plan to get a flexi loan.. as suggested by my friend..