General comments: if you can wait a month for Black Friday & Cyber Monday, you should get better prices. Second, try alternatives physically—eg in stores—to get a feel for what suits you.
What genres do you play, and at what level? Eg for competitive FPS , I've seen comments that a wired mouse is faster than wireless. I play FPS with a wireless and am totally happy with it, but I only play single-player for fun. For RPG you might want a mouse with ~20 buttons on it.
Mouse
The G502 looks a fine mouse and has great ratings there, so I doubt you can go wrong if wireless is good for you. The $120 price is as low as it's been in the past 5 months.
I don't know, but these days I get the impression that mice and keyboards are both mature products, so any high-rated one is likely to have performance very like all the other top ones. So it becomes a personal choice of features.
Razer also look fine, $66 is cheapest it's been this year so $69 is a good price.
Keyboard
Your KB did drop to $169 once within last 12 months, been $179 otherwise.
Looks a fine KB—great ratings—but I've never used a mechanical so can't comment. This is where personal use & preferences come into play—I use my PC for more than gaming so I couldn't live without the right-side keypad or programmable keys along the left or top.
My KB & M
For what it's worth, I have finally found my ideal K & M for my diverse needs after decades of futzing around with many alternatives.
Keyboard: Roccat Isku
like this one—it was around $60 a few years ago. It has 5 profiles you can setup for different games or genres—or any other non-game apps—where the custom keys are bound to different functions. It also has macro capability tied to 25 keys which saves me time in general work—I use it mostly for auto-typing common awkward phrases I use regularly, eg my email addresses. This all comes in an excellent driver which you need to install & play around with.
In my work profile, I use the 5 special 'M' keys on left and 3 'T' keys below spacebar for very frequent multi-finger tasks—copy, cut, paste, doc top, doc end, select all +copy, etc. Mightn't sound like much, but feels better for me
Mouse:
Logitech MX Master—still around the $60 I paid some years back. There are newer models available but I like this so much I bought a second last year for whenever current one dies.
I tried a 20+ button one, but could never learn to locate the right button quickly enough with my fat fingers—there's that personal preference thing again
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