As everybody knows, PHP 5.3 isn't based on all website hosting companies. I'd gladly learn about your experience and I'd like you to definitely recommend in my experience a great website hosting provider.
Take a look connect to begin to see the listing of hosting that support php 5.- http://nephtaliproject.com/php53hosts/index.php
Use slicehost in which you have more access and may do your personal PHP 5.3 install.
A great deal is dependent on which your needs are. If you simply need something simple that supports PHP 5.3, http://world wide web.alwaysdata.com/ is a great host having a free plan.