I've a hp 27" and using it's display partition feature I could possibly get away with it. one monster 30" monitor should be ok? tbh actually not sure whether a windows feature or it's the gfx card doing the partitioning? or the monitor itself? it does what it does, that's all I know but it works ok, I believe there are lots of different configs of screens and is a neat feature, sometimes!! t2w definitely doesn't like being pushed into partition screen and gets chopped to pieces. mine's currently set to two screens with a vertical split, I've not tried any other of the variations, mainly due to windows 8 and not being able to find sod all on the pc.
I'd still see a traditional multi monitor set up as best option, unless you're tight for desk space.
Funny you should mention the partitioning, as that's what I'm looking at buying a 30" for. I've seen it work on a dell u3011 on YouTube, split the screen into four, which would obviously mean 4 charts for trading. As you say though I'm not sure if it was a windows software feature or a screen management facility within the monitor. Will have to make enquiries as I'm currently looking at an nec monitor which will be connected to a Mac mini.
after a little more playing around, the vertical split into two screens I currently have is done by windows 8, I know not if it is configurable yet. I've found the monitor software and have uploaded an image of the screen variations that it provides.