Flat Panel Monitor Resolution question

I have a dilema that Im hoping someone can help me with. Im a pro
poker player. I play online. I currently have a 17" CRT. I want to
add a 2nd monitor because I always play 2 poker games at the same
time. Right now I have to toggle between windows by clicking the
window buttons on the task bar. I want 2 monitors so I can have 1
poker table on each screen and be able to see both tables at all
times. I know I need a new video card and have that angle covered.
Heres my problem. I want to do away with my CRT and buy 2 new flat
panel monitors. The problem is that if I use any resolution higher
than 800x600, the poker window doesnt fill the screen. At higher
resolutions, I assume that the graphics are crisper, but there no way
that I can find to make the window fill the entire screen, so I'll end
up with side by side 17" flat panel monitors, but the poker tables
themselves will only be 10" or so. If I lower the resoultion to
800x600 on a flat panel, the screen looks blurry.
Playing 2 small poker tables defeats the purpose. I can do that now
by raising the resolution on my current CRT.
I could just buy another 17" CRT, but that takes up too much space and
I'd like to enter the 21st century and get the flat panel monitors.
Is there any way to use the higher resolution, but change the icon
size or text size so it fills the entire screen?