SSD: a second drive or a change of the current HDD
I have an i5 quad 27" iMac mid-2011 with a 1TB HDD. Due to drags I made a radical decision to install SSD, but I'm not sure that I need to refuse 1 TB HDD and replace it on 500 gb SSD. May be the best way is to leave my HDD and to install 128 gb or 256 as a second drive under dvd rom? What are pros and cons of the second idea in respect to the effiecency and speed? If you'll give me an advice to leave my hdd, what should I buy for the OS, programs (Photoshop, Capture One) etc distribution - 128 or 256 SSD? I plan to use this configuration as a Fusion Drive.
Is this a good question?