I have currently JBL HTI-55 in wall centerchannel, HTI-8 JBL front and right, and JBL venue bookshelfs on the rear. I have an 8" Boston Acoustics XB2 sub..
I was able to sell the set for $400.
I found the Cerwin Vega CVHD-5.1 6 speaker set to replace them, i'm just making sure i did the right thing and got the best speaker upgrade i could (basically 5.1 for 500)