Vendor needed to reterminate cables

You could check with Drew at http://www.moon-audio.com/. I know he offered termination services in the past and I believe he carries Cardas banana plugs. I never did any business with him so I can't comment on his prices or the quality of work, but the pics I've seen of his work looked fine.

I would have AQ do it.

With proper crimping tools + set of nice shrinking tubes you can do same job if not better.
Just make sure to 'dress' shrinking tube prior to crimping.
Crimping is superior to soldering for the speaker wires.
I don't think that value of speaker cable will decrease more than you'll invest for the professional services. You'll also make a smart investment purchasing good crimping tool such as EZ-RJPRO

Check with Patrick at Cullen Audio. I was just on his site last night and he offers
a re-termination service.