Good place to buy a laptop in Lima?

Hi, all,

I need to buy a new laptop. Is there a good place in Lima to buy one, with fair prices and reliable warranties?

My very portable netbook simply isn't fast enough, or big enough, for my needs. I need something that has at least a 14" screen, is light enough to travel with, and reasonably, but not wildly, fast (i.e., good CPU and at least 4 GB RAM).