Monitor speakers pros/cons

I am looking for general pros and cons to monitor type speakers(ie. not full range) vs the floor standing "fuller" range types. Application being 50% 2ch and 50% HT use. Price range $5000-$10k ish for the front mains. New/used this basic range.

I am wondering if to get a true sub 45hz speaker this range, one might need to spend more. Or with this price range one might be better off going with the monitor speakers. Has anybody dumped a lot of money into monitors, and if so what were the results. Also with general room limitations(less than 600sq feet) are the full size models just an honest over kill, and would the monitors interact with the room better?

Trying to learn..
Thanks
Marty