Is this a personal PC as well? And how long will you be using it?
Personally I'm still iffy on the ultrabook platform, mostly because Intel still hasn't perfected getting their chips down to fit properly in a 17W TDP size. All of them throttle like crazy due to TDP constraints in lengthy and intensive workloads. If you don't care about the dips and drops in performance or won't notice them depending on what you're doing then I wouldn't worry about it. If you do, though, you may want to wait for haswell or buy a small notebook. The weight isn't really that different than a small notebook either and the price is usually too damn high.
You should sign up to this
Barnes and Noble thing and you can take advantage of some wicked discounts. If you don't want an Ultrabook and would rather have an IPS screen with a full i5 then you can pick up an x230 for less money. Outside of "thin", I just don't see the point of Ultrabooks at the moment. I have a feeling that Haswell might change that, along with the standardization of batteries and mSATA cards that's all coming next year, resulting in decent price drop and increased battery life.
Win 8 notebooks/ultrabooks are coming out soon and there's supposedly 40+ touch-capable designs already in the works. If you're going for productivity, though, I wouldn't want a touchscreen nor win8, so don't let either of those factors influence your decision making.