subs and monitors

have a pair of canton 202 monitors that were "saved" by a tube amp. i am now loving their sound but want those last few octaves of bass for impact and scale. thinking about the cheapest cylinder sub from svs. want to keep the price lower than $700.oo. any recommendations for this sub or another. smallish room 11x15. also would like some basic do's and don'ts on setup and connection. dont have a sub out on amp or dac