Great choice on the Monitor Audio speakers. 2nd best advice was to go slow on adding a sub. Subs are very important and deep bass is very difficult to get right. The MA's you have hit very high for the price and deserve a very good sub to keep up. I would suggest saving your money until you can afford a good REL or JL sub, maybe a better Pardigm, Monitor Audio or Veledyne. I am not crazy about Golden Ears subs. If you must boom out of the gate, I would go with a PSB, as all of there products are reasonably musical and accurate for the money IMHO.