The Z87-Deluxe/Quad is reserved for people who really want to use Thunderbolt in the future. If you belong to that group, there really isn't a reason not to buy this motherboard. Actually, if you're planning on building a new PC with Thunderbolt it wouldn't make sense to choose anything else but Thunderbolt 2.0, and right now this ASUS board is the only option on the market.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips