It is a "tricky" size ... the Castle 808 series should be one best choice now .. somehow, not many brands make for 1/14-1/18. Castle CM26 series should be a great power house too ..
2445 or 2440 would be good size, 2040 should be fine too .
May be some china brand you can buy in HK? hobby wing micro motor is a bit weak, Toro 4 pole micro should be good ..