So I read most of the first page, and skimmed the rest of the thread, so maybe I missed something so let me know if this is right -
you want a SCT basher
You want tough that does not need to be upgraded.
You don't want Arrma or Traxxas.
You don't want a race kit because you worry it will be fragile.
I would strongly suggest taking a look at the Tekno SCT410. Tekno is a real Beefcake among the racers. Arms are built like a brickhouse. Chassis and towers are 7k-grade milled aluminum. Driveline is all proper hardened steel. Shocks are smoooooooooth and strong.
New the kit is $370, so probably about $600 to get it running with all new hardware. If you shop the classifieds on here, Facebook and RCTech, you should be able to pick up an ex-racer, probably mostly RTR, with spares for under $400, or a roller/slider for around $200. I got mine (a SCT410.1) for under $200, and it came with spares, a Tekin motor, decent servo, and a cheap ESC, plus spares and lots of tires.
I also have a Arrma Granite 4x4 (same platform as 3s Senton) Arrma Typhon 6s (beefy basher), a Hobao Hyper SC10e (good but older racer SCT) and a bunch of other RC's. The Tekno is the best build quality, and in about 2 years of running I have only broken ONE part - an axle shaft on my first run (the SCT410.1 used a thin axle, the .3 uses a thicker axle - I swapped in the .3 and have had zero issues). My Tekno is "old reliable" - when I go bashing with the kids, the Tekno is often the only one that makes it to LVC.
Here is my build thread -
https://www.teknoforums.com/threads/jerry-rigging-a-sct410.529/
Also, check out
THIS post, showing the Tekno arms vs the Arrma 6s vs the Hobao SCT.