I agree with you 100% and have been tuning all of the parameters since we started! I never said I didn't or wouldn't etc. Tuning is more important than just throwing gobs of RAM at a problem BUT tuning with gobs of RAM is even betterTwo issues - the migration is done and dusted, no point going over that. Second issue is that increasing the current RAM will make zero difference, increase it if you want, but you may as well change the color of the server case while you are at it. Trust me, you've already got oodles of RAM, much more than busier systems than yours. You've got to look at things like query cache size, too small and your db will be going needlessly back to disk and having to recalculate everything which has a hit on CPU and will make your site slower.
The current servers are Dell and only come in Dell Grey but the new ones are HP and I personally find their aesthetics preferable, I'm sure they will run faster since they look better!