I've left the video card out as I'm somewhat foolishly hoping to still get some use out of my 9800GT for a few months at least, but I'm certainly open to options. As for the rest of the components, I'm not attached to any of these particular makes or models, this is just a starting point that hopefully I can refine with your help!
I mostly play strategy games and a few RPGs, so I'm not looking for fast framerates for an FPS or anything like that. I'll want to play Rome II Total War when it comes out, and Civ V would have some texture loading issues with my previous setup, so I'm not against getting a decent video card down the road if I can squeeze out a bit of use of my old one now.
I think my monitor only supports up to 1680x1050 (DCLCD 20.1").
Oh, and on losing the SSD - is it really not of much use for gaming? I'm intrigued by lightning fast boot ups it offers and was under the impression that it would speed up a few games that I did decide to stick on there (loading times and whatnot).
The SSD will help load all programs faster. When it comes to multiplayer gaming the maps load really fast.
For example, when I play a game like tf2, I am always the first in the map, but that doesn't matter anyway because you have to wait for everyone else anyway.
I don't ever suggest dropping an SSD, because in my opinion they are worth it for all around pc usage, but I would rather have a nice GPU for gaming. In your case though, you might be able to stick with your 9800.