From the Joomla side of things I only have CB, Virtuemart, ITPSocialButtons, JAT3 framework and a fairly bland jat3 template... Have not got round to installing other things because want basics working first

From server side I have a lot of room for expansion! Quad core, 4Gb RAM etc so not shy at throwing memory at things...

Basic Ubuntu, Apache, MySQL, PHP, Postfix, Clamd, Spamassasin, Amavisd so things should be rattling round with plenty of space still...