I'm going to make this short because there is not enough time left..
There is an offer for a Kingstone V+200 120GB SSD for half the regular price, about 70eur/100 usd. Only about 60 on stock and they will all go before the day ends.
My computer so far:
32gb ram (on the way)
256gb SSD for OS and applications (on the way)
6 x 1TB Samsung 7200 drive
1x 1.5 TB WD 7200 drive
Would it be wise to buy the 120GB SSD for a scratch disk or is that not enough storage?
I mainly work with Premiere Pro CS5.5 editing videos from my Canon 5D2. Here and there I use AfterEffects and Lightroom..
So the question is only about the above 120GB SSD for scratch - simple answer - yes or no?
With 8 devices installed in your system, you don't have any SATA ports left for an extra SSD or disk.
I can always throw out the 1,5TB HDD.
My question is if a 120GB SSD is big enough for a scratch disk?
My projects go from 10-150gb (the size of all files in preimere before editing or exporting).
Simple answer - NO!
It would be large enough, but probably slower than using the rotating drives you already have in RAID 0 configuration. Also, if you want to experiment with a SSD as scratch, use your planned new boot drive for a test. 256GB is much larger than you will likely ever need for OS/programs and 256GB SSDs many times have write speeds that are better than the smaller drives in the same family.