I recently purchased the Team Associated B7 which is my first kit and am in need of a servo, esc and motor for it. The motor being anything goes but 6.5T is the fastest you're allowed.
Currently I have been using an old Xray which got me started as to see how I got on with the hobby. I must say I'm enjoying it a LOT and everyone I've come across here and at my local(s) are very friendly and helpful.
The Xray is not mine though, I'm just borrowing it.

I currently race outdoors on Astroturf but looking to do carpet as well. Luckily it hasn't rained yet but unsure what I need to protect or even how to do it for the wetter conditions.
Anyway, back to topic. I was thinking of Hobbywing however there seems to be various Hobbywing ESC's so a little unsure on what to go for or differences. None of them seem to mention if they're waterproof or not though?

For servo I was thinking of Reedy RS1606A (The high speed version) which someone already recommended me. That same servo has a high torque and high speed version but wasn't fully aware which is the better choice.
I've seen some videos about Protek however I can't seem to find them on the online shops or at the local store. I'm in the uk.
Would be nice to hear what you guys recommend or are using.

Lastly, I wasn't sure whether to post this question here or in the off road section. I hope the question is okay here.

Thanks again.

On large outdoor tracks a 6.5T is usually a good idea - if you decide to race modified. Any halfway current model from any reputable brand should do in modified. Stock classes are more choosy.

For an ESC, i'd go Hobbywing myself - I've been using them for years and like them a lot. XR10 Pro G3 is the current one, I believe (for Mod). BTW if you run mod, use timing or turbo options thoroughly.

I like r1 for esc, motor, and battery. There's a handful of motors out there I would like to try that aren't r1.

For servo nsdrc ss400. I have a protek 160t on my 21.5 buggy but that's starting to die out/glitch. I have an older ss400 on my 17.5 buggy but that one is still running strong with no issues I can think of.

Radio flysky noble. The older one was a deal. The newer one priced more accordingly.

I recently built a B7D. Tight indoor clay track. I haven't raced in years, so I am starting in the 21.5 class. I went with a Reedy 600z-G2 ESC with a Reedy SP5 series motor, Flysky Noble NB4+ radio/receiver, Protek 575 servo, and a Trinity 130C-5600 battery. Those batteries are in the Horizon Hobby clearance section right now for really cheap! Seems like a perfectly decent setup for a low-power spec racer. I can upgrade the motor and ESC down the line if I want to race in another class.

I'd recommend a Hobbywing XR10 G3 or you could look into their XR10 Pro WP (waterproof) if you think you'd need it. The WP is based on the XR10 G2 I believe so it wouldn't have all the latest and greatest settings of the G3, but it still rock solid. If you go with the XR10 G3, I'd just get an ESC/Motor combo in whatever turn you'd prefer, you can't beat the quality or value there. Hobbywing email support has been great in my experience, but I can't speak to warranty/repair service.