I don't recommend low-end monitors that then need a separate subwoofer for adequate bass-signal referernce, Duecemade...
I think that a good pair of, you guessed it, amped speakers, like Infinity, JBL offer a great reference signal for a much lower price than the lower-end monitors a lot of comapnies are trying to push these days, don't fall for it.
I would only recommend getting active monitors when really getting into your business, which would mean the 800dollar and up models which definitiely give you a nice reference signal (supposing your studio is built with that in mind). That's when the word "Genelec" becomes part of your vocabulary, lol...
Good luck.
Sincerely,
God