For 2wd the ansmann x2sc may be cheap but you can't knock the quality
There's loads of spares on eBay and upgrades available to
Electrics wise I ve always found pay a bit more for reliability
Waterproofing I never bothered just get the under shell they are available or failing that get the buggy version body shell and make them fit
Best to see what over people at the club run as spares will be at hand and setup advice will be around
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