As a (former) VelociRaptor (and Raptor 2003 when the 36 and 73GB came out) I am all about SSD now. I still use those VR drives but just to clone the system is all.
600GB is tight? What does Omni DiskSweeper or WhatSize show is taking up space? X-Plane? all the video and graphic suites? 300-400GB is a lot. The boot drive can and will be used for cache by some suites too.
1TB SSD is now only $369, about what I paid for some 10K drives in the past. Generally a 500GB $209 is more than enough and most opt for 250GB / $115.
If you have a lot of audio libraries, plug-ins and such or other gaphic libraries for Lightroom, they also benefit from SSD but I would use a separate drive..
A good 7.2k platter today is fast and quieter than 600GB unit you have and capable of 180MB/sec.
You can use an SATA III PCIe controller with two 500GB SSDs for $500 or you could get 1TB, and there are those blade drives that are to me ~1300MB/sec.
I love the XP941 and wish I had the money for the 256GB now that I have used it ($269) as it is 3-4x faster than an SSD on the native drive bays where it tops out at 250MB/sec for standard SSDs. An SATA III PCIe offers ~500MB/sec out of an SSD. So an Apple/Samsung blade is ~2x faster than even that.
