Architecture of my site: Chameleon, MapLab, MapScript, etc. What should I use ?

[Rodrigo Tomasi]

Hi,

I´m searching for the best architecture for my MapServer site. 

I´m with difficult to understand what is the difference between these
tools: Chameleon, MapLab, MapScript. Can anyone point me in the right
direction or send some documentation ?

My page will run on Windows. I want to build a page with PHP that will
display a mapfile with about 150 layers on Oracle Spatial or
Shapefile, with the following commands:

- Zoom in
- Zoom Out
- Full Extent
- Pan
- Identify
- Measure Distance
- Layer´s list loaded from mapfile and divided into groups (vector and raster)
- Show/Hide layer

Users will enter in the site by entering the main page (overview) or
by making a query on a Table and the clicking on "View Map" button
(direct view).

The page will be part of an Environmental Information System. 

Any ideas ? What´s the best option to me ?
I have experience in ArcIMS (C# Development), so I think when I
understand the architecture things will clear more rapidly.

Thanks in advance,

    Rodrigo