Iirc the B-Max2 MR even accepts a stick pack in mid-motor configuration if you use a low-profile servo, but I could be wrong. If you want the car just for driving around a little bit, there is nothing wrong with all these kits. If you like the looks of the current 2WD buggies on the track, you should bite the bullet and buy a modern kit together with one or two shorty packs. Things have evolved a lot in the last few years. There are many viable options out there, but if you want to keep up with others, I'd not recommend any of the ones you listed, unless the RB6 includes the latest version, the RB6.6.
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