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I design my sites with fixed width (ducks to avoid flak).In that case, if the screen is wide enough (in pixels) it doesn't matter which you buy.
With regard to previewing, it's fine to use a WYSIWYG editor like Dreamweaver, but you should always preview/test with Mozilla first, then IE and maybe Opera as a final check.
A 19" 1280*1024 monitor is easy to work with. A 19" widescreen will be better for entertainment. So, unless you plan to use it to watch films or play games, I would avoid the widescreen (but you won't be able to do so for much longer).
Kaled.
A 22" 1680*1050 monitor has a similar pixel size to a 19" 1280*1024 so that would be my second choice (but the pixels are slightly smaller).
Given that you are using a 15" monitor right now, I'm guessing that you have an oldish graphics card too. If it does not support the resolution of the monitor, you'll need a new card.
Kaled.