if im buying from dell, which video card will allow me to multi-table on a 15 inch screen?

Integrated Intel® Graphics Media Accelerator 900 [Included in Price]
ATI MOBILITY™ RADEON® X300 64MB HyperMemory™ [add $50 or $1/month2]
128MB DDR ATI's MOBILITY™ RADEON X300 PCI Express x16 Graphics [add $119 or $4/month2]

Also, can someone comment on the EV of warranties etc.?