Sounds like the straight SSD build would have plenty of space for your needs.
I wouldn't worry about SSD longevity. They're designed to handle a LOT of written data, and reads aren't a problem for them. Even Intel's new 20nm NAND-driven 335 SSD can handle a lot of writes, and the first batches of NAND on a new process node can be weak with the max number of writes.
I've attached a screenshot of some SMART/health readings from my own main SSD, which has been powered up pretty much 24/7 since I got it in March 2011. I've written over 5 TB to the drive and it's reporting zero issues. No retired blocks or program/erase cycle failures. -- KI6RIT
Ok so let me see if I got this correct...speed wise the SSD will boot faster but the SSD and SATA drive will run about the same after the OS has booted up or am I wrong?
Octavean Premium,MVM join:2001-03-31 New York, NY kudos:1
For the most part,
In a pure SSD environment the system will boot faster as you said but applications will start faster too. The system will overall feel more responsive in many cases. Disc intensive applications / operations will typically receive speed improvements as well.
In the hybrid SSD cache + HDD case, if there is something that isnt in the cache you drop down to the speed of the HDD