THINKPAD T440P AND T540P series are coming out with Haswell as well by November so I can wait a bit. W540 is too bulky IMO despite the specs. Never had a Thinkpad before but I currently have an Ideapad and its POS. I'm highly considering the Thinkpad though as Lenovo usually offers very good discounts during Black Friday.
Lenovo brings Haswell to rest of ThinkPad line-up, including monstrous ThinkPad W540
I spec'd out a Dell 14 XPS as well but didn't have room upgrades.
All in all, mine comes down to Haswell, SSD, GPU, 14" HD, and 16GB RAM. Mainly using it for rendering, CAD modeling, and Photoshop.