I just went through two month of exactly what you're talking about starting. Bought my 23" LCD TV 2 weeks ago. (1080i, 3000:1 Contrast, 1280x720 15 pin D-sub VGA, Inputs: HDMI, PC, Ant, 2 Component, 2 AV, SVideo, Speakers below screen) Was looking for the same requirements you mention, except I have a Roll Top computer desk and can't physically get anything bigger than a 24" in it. Also most of what I found with DVI had the speakers flanking the screen vice me wanting underside speakers. I finally gave in to a deal I couldn't refuse and bought a Samsung LN-S2338W for $220.
Most others meeting your specs are going for ~450-800. Let me check my notes and see which models were best contenders...
Philips Magnavox 26MF231D 26" - has HD tuner built-in
Toshiba 26HL66 26" - has HD tuner built-in
JVC LT-26X575 - has PIP
Samsung 26" - same as mine just bigger