The link I gave titled "LCD thread" has a long, extremely informative opening post about LCD types and their uses.
If I remember correctly, basically TN panels are cheaper (you won't find anything but them in sub-24" LCDs), have poor black, poor color representation (6-bit), and bad viewing angles. But they have fast responce times and are cheaper.
Your VA panels are almost as fast with a few new tricks they pulled, often have the full 8-bit color representation, and have very good viewing angles. They are more expensive. The 24" Soyo is a P-MVA panel.
The IPS panels have the best color, best black, best viewing angles, but have slow responce times. They are very expensive and hard to find.