Hi Malcolm,
Now i have never done an actual price comparison myself, but friends of mine that travel up here regularly from Australia, like to buy electronics here, because they get a latest model for the same money that they would pay for its predecessor in Australia.
So i guess its best to check out the various models your considering, and then at least you can make an informed decision on the ground when you are here...
There are 2 malls here that focus on IT they are Funan IT Mall, which has a better and more professional reputation and more or less fixed price, and Sim Lim Square where you can bargain a bit..
B&O I think is comparable pricing to UK from what i can tell from prices quoted by members on beoworld and what prices I have checked here myself , however I have also heard some say they think Singapore is much more expensive...
Happy Shopping!
Laurence.