I didn’t realize that was DC only, sorry! The Hitec RDX2 Pro is a bit pricy, but that’s all that I could find for a decent AC LiPo charger. I recommend waiting for someone else to help you find a good charger in your budget.
I had one, it was overcharging my LiPos so I returned it, I luckily didn’t have a fire. Don’t get it, get a better one. Instead, get the Dynamite Passport P2 as they have much better QC.
100w and higher for a single channel, this will allow up to 6s at 4.5A. It’s good to have extra room so you don’t run the charger at 100% all the time.
Welcome to the forum! The Arrma Granite 3s is great at $370 with no LiPo or charger. A LiPo and charger will set you back another $100-$150.
The brushed Stampede is slow and underpowered, I don’t recommend it, any 1/10 or larger 4x4 running on a single brushed motor isn’t the best.