6S would be overkill... unless doing speed runs. I buy off-road RCs to run them... off-road. Ruts, bumps, and jumps pushing shocks to the limits is "what does it for me" in the hobby. If I gotta buy belted big lugged knobby tires to enjoy off-road... I'm going too fast. Going to a site/area that allows you to open up an RC to 40+ MPH is fun and all, but I like to see things happen close up. That's just me.
A 4268 1900kv motor would be great place to start. Pick your favorite brand and go. Visiting top ESC/motor brands websites will maybe persuade you in different direction than what you had originally thought. For a buggy basher build I went with ultra low budget Surpass Hobby motor...
Later on I went with another Surpass Hobby motor. The 4274 Rocket motor was not enough for my monster truggy build so I put it to use in my EB48. I chose the 1700kv because (in my head) the powerband was better suited for my tighter backyard track. I didn't need that extra top end speed. The longer (truggy sized motor) can was just because I wanted extra assurance to handle extended run times in summer heat.
(Sorry for the dirt. It's the only picture I got with motor mounted in my EB48)
So many options out there for electronics. For 4S running... 1700~2200kv would be my pick. I'm a Hobbywing user more often than not, but discounts/sales lead me to other brand of motors. If even thinking of going to a track to do some racing, then I'd recommend looking into a sensored setup.
Back to OP's original question... I've still haven't opened latest kit/present from wife that she (me) painstakingly wrapped two weeks ago. But when I do crack that kit seal... it's usually a one~two week build process. Stuck indoors during the winter months... closer to one week. I enjoy the build process more than anything in the hobby, but it only last so long, and I can't be buying a kit every week. So, I make the build last as long as I can.