I currently have suPHP running on my server and obviously can't run APC to take advantage of the caching abilities of xF. Are their others I can use, since so far most people have recommended I not disable suPHP and install APC
APC will not help you if your Apache uses prefork mpm. Either you should move to worker mpm + mod_php or use fcgi php configuration using php-fpm + mod_fastcgi.