Re: PHP Versions
What do you mean with extentions?
Are you talking about php extentions, written in C, or just MCCode ones?
Most hosts these days uses PHP 5.x, PHP4 isn't that behind when it comes to the normal things.
Only when you explore further into PHP, closer to the core, you will feel the difference between PHP 4 and PHP 5.
So you won't have to be modifying your scripts anytime soon.
I mainly use PHP6 -dev compiles of php, since my system spits out allot of errors when I play around with php.
On your list, and for the normal useage, I voted PHP 5. (:
