Upgrade from Merlin VSM-M to What?

I have a wonderfull pair of Merlin VSM-M speakers, but I want fuller range. I have the balanced/single ended battery bam and it does extend the bass, but not as low as some other full range speakers. I have been lead to believe that my Karan KA-i180 integrated amp could sound even better with fuller range speakers. I don't want to spend a bundle of money. I just purchased a Pioneer 5060HD plasma and my budget for speakers are $1000.00 more then I will get for my VSM-M's. So my hope is for used speakers costing between $4,000.00 - $4,500.00. My thoughts are toward Dunlavy or Eggleston. Shipping these speakers must be taken into account. I do have sub woofers, but don't use them. They are Velodyne servo 1200's. My integrated does not have preamp outs and I think using the subs x-overs in the speaker line would harm the sound.