I am trying to decide whether I should Install a 120/128GB SSD or add a Larger hybrid HDD with an extra 2 gig RAM upgrade. I currently have a 2010 MBP with 4 gigs of Ram and a stock 5400 rpm HDD. I am thinking of replacing the HDD with either the Crucial RealSSD C300 128GB or the OCZ Vertex 2 120GB. I could also use that money to purchase a Seagate XT Hybrid 500GB drive and then use the extra money to purchase a 4GB stick to replace one of the stock 2GB sticks. What's are your thoughts? What is the speed difference between the hybrid and the SSD's? If you chose the SSD, which one?