I usually cut my vege into small pieces, steam it, then use a blender to puree it.
I think Avent has come out with a 2-in-1 steamer cum blender. I dont't own that but it seems conenient.
I'm using a Braun hand blender and a Braun steamer. I like the hand blender coz it's easy to clean and light to use. It's good to get your steamer and blender seperately coz you can also use it for cooking your own meals.
It's actually not advisable to start with strawberry purees as it's one of the fruits that can cause allergies. You may try apple or pear instead. If you're making your own fruit puree, it is best to steam the fruit before pureeing.
You might want to refer to this site for a list of veges and fruits and the age range which is suitable to be introduced. www.wholesomebabyfood.com
If I'm buying commercial purees, I go for Gerber or Healthy Times as they have a wider range of single vege/fruit purees and that allows me to weed out allergies.