Hi Robin
The bank will not give you your mortgage if they see you have got a loan for it
a deposit for a house approx €364k would be €29,120 plus you will have stamp duty of approx €10,920 = €40,040 plus solicitor fee/valuer etc so for first time buyer id try stay under the €317,500 so the deposit is not as much
stamp duty is based on the price/size if you go over €317,500 you will have to pay 3% stamp duty (first time buyer) im not to sure about the size.
hope this is of some help
Mary