Monitor or fullrange ?

Hi, I listen to Jazz and Big band mostly and have my speakers about 9' from my sitting position. I am using Infinity RSIII speakers with a Soundcraftsmen ma5002 amp and Foreplay preamp. This set up has much more power then I need and the VU meters do not even move at my comfort level. ( also own a ma250 McIntosh and def tech 15" sub with crossover and internal amp ). I am intersted in used monitors for around $500 and would like some feedback from my friends here on heading in this direction. Thanks for any help,
Guycom