take a look at these...they're odonnell big bores from tower hobbies. $68 shipped to your door, you can't go wrong....
http://www3.towerhobbies.com/cgi-bin...LXWDX1&P=7
http://www3.towerhobbies.com/cgi-bin...LXWDX7&P=M
as far as oil...for bashing i'd run a little heavy....maybe 50wt losi oil or even 60wt....racing i personally run 45 in front and 40 in the rear..