SSD alone would make a tremendous difference, if you want to keep it simple, I would suggest that route, for now.
Please explain how/where the performance improvement will show once everything is running. It's on my next build list but I'm not sure it will do anything for me now.
+1. for most of us who only turn our computer off when we are restarting it to apply an update, a faster start up time is of little to no value. besides, if you're smart you disable automatic update installation and just have the updates automatically dl'ed but you install when you want - before I learned this lesson I'd wake up one morning and wonder why the computer had restarted only to later realize it was windows updating.