Make sure you can get parts support for that Xray. It would kind of suck to break parts and then have to wait a while to get parts. Most of the advice around here says to see what everyone at your track is running as well as what car parts your Local Hobby Shop stocks, but if they can get you parts I would go for it. If other people at the track pilot Xray's then you can get setup help to.
TT-01/Hitec MG/SP LPF V1.1/Trinity 7.5
Losi Type-R/JR Z8800S/SP Cirtix Stock/Novak 25.5
Exotek F1R/Savox 1251/Tekin RS/21.5
"ELECTRIFIED TO THE HILT"