installation questions

[Ravi]

Hi there, I have a fee questions regarding installation:

1. I do not want to compile mapserver. Is 
http://mapserver.gis.umn.edu/fgs the best place to get mapserver binaries?

2. The problem with fgs is that it comes bundled with apache/php etc. If 
I purchase a hosting account, it usually comes with a latest version of 
apache/php. Is there a guide explaining how to install mapserver with 
existing apache/php installation?

3. Does somebody know what is the disk size requirement for complete US 
street map at say 1000x zoom level? From there I can calculate other 
disk size requirements by simply adjusting for zoom level. I need this 
to find out much disk space I need.

Thanks
Ravi