Hi CCC78, greetings from a fellow Irishman.
First, I would suggest that you google a Singapore map and put it on your screen so that you can refer to it for what follows
By international business centre do you mean International Business Park? Because the International Business Park is in Jurong which is on the west side of Singapore. And that would mean that the well-intentioned advice about living on the East Coast and commuting to work would perhaps not be your best option.
If you will indeed be working in Jurong, you would be best advised to look at
condos around that area. There are quite a few along the East-West MRT (Singapore's DART) line that would suit you. (The International Business Park is fairly close to Jurong East MRT station.) Roughly speaking, the further west you go, the better value for money you'll get rent-wise. The further east you go towards Singapore's Central Business District, the more dosh you'll have to pay out. The disadvantage of living that 'far out' in the west is that there are relatively few western-style bars and eateries.
If you want to live a little close to the sea, you can look at areas like Pasir Panjang Road and West Coast Road. There are lots of nice
condominiums there and there are also plenty of frequent buses that will take you to Jurong East from there. Don't worry about having to rely on buses as Singapore's public transport system is light years ahead of CIE...
Pasir Panjang Village has some nice restaurants and bars too that I suspect you would like (from an Irish perspective). But please don't have any visions of morning swims in the South China Sea along West Coast Park - you'll be severely disappointed!
Your budget should get you a reasonably nice apartment (or
condominum with facilities like swimming pool, tennis court, small gym etc) in either of these areas.
Singapore's Central Business District (CBD) could best be described as been slap bang in the southern central part of Singapore.
You could live on Singapore's 'north coast' and get the MRT to Jurong East too but it's quite 'far out' (by Singapore standards) if you want to go into the CBD at weekends.
I think perhaps the most important advice I can give you would be to insist that your company puts you up in a
Serviced Apartment for at least your first two weeks here. That way you can take your time and really examine the ground and decide where is best for you. Don't be rushed into deciding on your home for the next two or more years.
One final piece: when you get here check out the Irish Business Association and the St. Patrick's Society of Singapore. The Irish community here is small but friendly and I'm sure you'll be made to feel very welcome!