Should I buy a folding bike?

I want to buy a bike but dont know what i need exactly. These are my criteria:
for commuting on transport [buses and trains]
can have a carrier attached for laptop
Affordable
ability to go up inclines [this is not too important]
Stylish XD
Where do i get one

I like the Pashley models but they are $$ and in the UK, i n eed AUS. A lot of the cheaper foldable bikes dont seem able to have a bag rack either, which makes me think a normal bike is best. But then again i travel during peak time usually so a normal bike will be too cucumbersome plus i have to hire a bike port at UNI. Ahgrrr! Please help me.

1. Considering Quality and Looks, check out Dahon:
   ‘http://www.dahon.com/‘

   There are a lot of different models to choose from so look what is within your budget and also budget for accessories like a Light, Helmet, Gloves, etc… These will make your rides a lot more enjoyable. Enjoy your ride!