It depends what kind of crawling you want to do, sofa crawling, Scale looks, speed (Wraith), Insane vertical climbs, or just crazy overall performance (Super cralwers)
2.2 RTR comp, Losi night crawler.
1.9 Losi mini crawler, or Mini crawler Pro.
B4 Mamba. 'Nuf said.
RC18T (added wing)
GC-3 gatekeeper Losi Mini-Crawler
Original Mini LST (Exo-Tek LXT Single Servo Converson, Traxxas servo)
Soon to be Quadcopter.