can buy ameda from robinsons' centrepoint (baby dept, 5th floor) or breastfeeding mothers' support group i think both only carry Ameda Lactaline Dual breast pump.
personally, i'm using medela pump in style. i find that dual pump saves time = faster pumping
Though i have heard feedback that there's not much difference between ameda and medela. Ameda's definitely more affordable. i have not tried out the pumps personally as i missed the chance to do so when making decision to buy. (didn't know about the support group selling pumps). you can visit the support group's office to try out their pumps.