If 500GB SSD + 2TB HDD is the same cost as 1TB SSD, I would go 1TB SSD without a second though. The question for you is are really going to fill up that 2TB HDD all the time? I retired all my HDDs out of my systems like almost 12 months ago. I put all my 2+TB HDD into USB enclosures and use those as offline backups. My 1TB SSD have yet to get over 50% full yet.