Hello,
My last laptop had Intel wifi too. I purchased myself a D-Link DWA-642 device, which is known to work with free software. According to what I've read, your laptop has an Express Card slot. A D-Link DWA-643 wifi card (http://www.h-node.org/wifi/view/en/78/AR5418+AR5133+AR5008-DWA-643-Atheros-9000-series-chipsets-based-PCI-MINI-PCI-E-802-11a-b-g) will fit nicely in there, and you can probably find one for under $25.
