ness,
check out
www.slickdeals.net for deals they have on Dells.
you can buy a machine that'll do everything you want for supercheap.
.edit i noticed you checked out fat wallet
you want the largest monitor, at LEAST 1GB of ram.
most important thing for playing cards is the monitor, ram and cpu.
gfx card, harddrive, etc is less important for regular desktop usage.
do you plan on gaming?
.edit oops missed the dual monitor - you'll need a gfx card that supports dual monitors so integrated gfx is out.