Welcome to Coffee Snobs.
The 6910 comes with 4 baskets.
Single single floor
Double single floor
Single double floor
Double double floor
The single floor single basket is tricky to get a decent shot out of.
Most people here only use the double basket.
What dont you like about the taste?
Have you tried adjusting the grind a little finer and pulling a shorter shot (ristretto) to see if that helps with the taste?
The instructions with the machine include a list of Sunbeam agents that should be able to order you a basket if they dont have one in stock.
If you dont have the list just ring the Sunbeam Coffee Helpline and they will point you to the nearest one.
Where in Sydney are you (please update your profile, it helps with offering help).