Hi UFM,
I have tied for over 12 years now, and I still have some of the orginal tools, thumb disc bobbin holders, dubbing brush, bobbin threader, however, it gets used as a varnish applictor now.

Whip finish tool, fur rake, self sharpening scissors.
Ive only bought a few things in the last few years, dubbing spinner, and tension adjustable bobbins, rite-bobbins I think there called.
IME, I think you should stick to what your comfortable with, tools that havent let you down.
But if you want to spend some of that money burning a hole in your pocket, I would say the stonefly set is a reasonable purchase, and a good set of scissors, I have the adjustable kind, and 2 others, one for wires, and one for furs etc.
The likes of dubbing rakes, they can be made in-house, bit of velcro on a ice scream stick is great for that use, a needle inserted into a wine cork makes a great varnish applicator.
A Empty Bic Biro Case is perfect for pushing hackles back for tidying up the eye of your flies.
And the good old finger for half hitches.
GC