I've decided that I need to add an SSD to my iMac to speed up performance a bit (Lightroom specifically). My model (27" base) has a 1 TB dog slow hard drive. What are my options? 1. Replace 1TB drive with interenal SSD 2. Add internal SSD along with 1TB drive 3. Use an external SSD via Thunderbolt and boot off of that I'm a bit squeamish about taking my iMac apart, but the idea of shipping it also doesn't sound so great (I don't have the original packaging). That's why I was initially leaning toward a Thunderbolt SSD. What would you do? Or, what have you done?