should I go for the HP ZBook 14 Mobile Workstation - Core i5 4300U or save $500 and get the Acer TravelMate TMP645-MG-9419 Intel Core i7 8GB? I'd like to future-proof my purchase, and it looks like the ZBook is easily upgradeable, but I question whether it's worth the extra money. I've also heard that Acer's tend to be unreliable. Anyone have any experience with the Travelmate?