Have you looked at the Logitech MX master? https://www.amazon.com/Logitech-Master-Wireless-Mouse-High-precision/dp/B00TZR3WRM

Not a gaming mouse but has customizable buttons and a second wheel on the thumb. The thumb scroll can be used for horizontal scroll in Ableton. It was a game changer for me

So for mouse I would get a Logitech MX Master (https://www.amazon.com/Logitech-Master-Wireless-Mouse-High-precision/dp/B00TZR3WRM/ref=sr_1_3?s=electronics&ie=UTF8&qid=1509671729&sr=1-3&keywords=logitech+mx+master) or MX Master 2 (https://www.amazon.com/Logitech-Wireless-Cross-Computer-Control-Sharing/dp/B071YZJ1G1/ref=sr_1_4?ie=UTF8&qid=1509671675&sr=8-4&keywords=logitech+mx+master). Both are very good options and are wireless and can be turned into wired if needed. Also the MX Master 2 can connect/switch between multiple computers with different os. As for the mechanical keyboard, it really depends. What do you like? Clicky/Tactile? or maybe Silent/Tactile. It is really up to you. But I really like the AZIO MGK1-K (https://www.amazon.com/Azio-Backlit-Mechanical-Keyboard-MGK1-K/dp/B010M53SLU/ref=sr_1_2?s=electronics&ie=UTF8&qid=1509671927&sr=1-2&keywords=azio+mechanical+keyboard) as brown switches are my favorite.

What items are eligible seems to be hit or miss. I've been wanting to get a new mouse, so was thinking I could possibly do it through this promo. But some gaming mice are included, while others are not.