You could also get a Xray X10 link car and buy a conversionkit from LAJF and a IRS 235 axle.
Works like a charm
The CRC rear hubs tend to get play if they grow older and thus wobble
RC Devil, VIP racing, Speedmerchand and some other build also 235MM cars
The Serpent i can't advice you.
Seen some one run the car for more then a season and didn't have any trouble with it, but that was before the 235 kit was on the market.
Regards Roy