Current generation VAIOs are pretty powerful, but unless you're buying from the US, they tend to be over-priced. The VPCS117GG
(I'm assuming you want lots of screen real-estate, right?).
To save some money, try looking for a laptop with lots of RAM and of course storage. High-end graphics isn't that important, unless you constantly do 3D design. Look at Sony's larger laptops, or consider another brand like Dell or HP.