Text/image dithering on HP f2105 monitor?

Help! I connected an HP f2105 21" widescreen lcd monitor to my G4 and noticed that text and images don't appear smooth—they contain jagged edges, much like low-res graphics dithering. I'm in graphics as a profession so this is unacceptable. Any ideas to correct this? I have colors set to 'millions' and resolution at 1680x1050. The monitor's 'scaling' is set to 1-to-1. My graphics card is an ATI Radeon 9000 Pro with DVI connection.

I may exchange this monitor for a Dell 2007wfp, but wonder if I'm going to have the same problem? Is it a dot pitch issue? The HP f2105 has a .278 pitch, while Apple Cinema displays (and Dells?) are about .25.

Thank you in advance for any help!

Graphics/Display specs:

Chipset Model: ATY,RV250
Type: Display
Bus: AGP
Slot: SLOT-1
VRAM (Total): 64 MB
Vendor: ATI (0x1002)
Device ID: 0x4966
Revision ID: 0x0001
ROM Revision: 113-99702-127

Displays:
HP f2105:
Resolution: 1680 x 1050 @ 60 Hz
Depth: 32-bit Color
Core Image: Not Supported
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Rotation: Supported


Power Mac G4 MDD+FW800 Mac OS X (10.4.8)