4 vs 5

Hi all! I'm about to reinstall PHP/MySQL/Apache (+ MySQL Front) on my WinXP machine... It's been a while since I last installed this package and there have been some version changes... Should I go for the old Apache or Apache 2? And most important; can I have a dual install of php4 and php5 or is it possible to force php5 scripts to run in php4 compability mode? My webserver is just local and I use a webhotell for everything I do. They do not have php5 installed. And probably won't have it for quite a while. I donät want to make scripts that wont work bcause of their older version of php. At the same time I want to migrate to php5 so that I can learn it... How should I do? _bobo wieland