As you already know ive just moved onto the nuc. And i was also thinking of the three, nucleon Fusion and speedster.
But one of the deciding factors for me was the test results.
Fusion scored 8 B's and 4 C's
Speedster 3 B's and 6 C's
Nucleon 6 B's and 1 C
I liked the lower C's bit..
But im probably biased because my last wing was a synth which i loved..
And it wasnt because i liked the colour Morgy