In the next few weeks I'll be upgrading my site from Terran Tribune to a new template (haven't decided yet). The site is reasonably large (400ish articles) with quite a few sections/categories. I've got a few weeks to plan because I can't go ahead until my organisation upgrades its 6000+ desktops to IE7 (they're on IE6 currently). Sadly (or not) no IE8 until about 20 years after I retire.
As so much as changed in the template world since the magnificent TT, what are the important steps and/or traps I should anticipate? Would it be better to start fresh and import the db into a new "site" or should I just (carefully) upgrade the current one - installing necessary components/plugins etc?
I've upgraded Joomla sites before but not on this scale or complexity (and I'm thinking Gantry issues etc here).