Hello!
Congrats on the E7
I run the same servos on mine. The helijive is a great esc will work great for most of the motor options. I like the 4525 520 ultimate and the 4530 500 le. Both are great fits for this helicopter.
I have also ran the Hacker A50-12L 470kv. Works well. Many love the KDE 700xf 495. I am also hearing great things about the new Castle Vertigo 700.
As you can see the E7 is a very versatile platform and there are many great motor options.
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