MB have got an excellent deal on these 17.5 motors at the moment:
http://www.rccarshop.co.uk/index.php...lt/?q=ORI28216
Regarding batteries, I'm not sure what config the SV2 takes. In my cars I run shorties and find that my Turnigy Ultimates are every bit as good as my Orions and £15 a pack cheaper.
http://www.hobbyking.co.uk/hobbyking...Approved_.html
Cheers,
Ian