The Linux one and cheaper Windows one also have only single core processors with no option to "buy up" to the dual core. No thanks - that might as well be a netbook, speed-wise.

Once you've got the dual-core processor, not only is the 30Whr battery seeming even more inadequate, your price is up to $649. A shame as it is a nicer bit of design than you normally see from Dell, but the compromises to do it are way too big.