Compile a list of web hosts that meet your criteria, then do some research on them here on web hosting talk. It would also be a wise idea to contact the web host and test their support response timings.
Many hosts are now offering PHP5. Do a WHT search for "PHP5" (limit your search to offers section for better results) and you will find plenty of providers in the WHT itself. Also keep in mind that most hosts offer PHP4 by defult and you can simply update to PHP5 by adding a simple rule on your htaccess file.
Best of luck with your search
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PHP 5 is available fairly widely and it is now possible for cPanel hosts to run both & 5 on the same server if they choose to so there are becoming more all the time.
It's drifting along and is becoming more & more common. No longer in the "hard to find" category at all, not for quite some time now.
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