Without a doubt those are not equal to your 6010. I would suggest a VT60 which will equal the 6010 (actually a little better blacks) in performance. That may be easier for them to accept based on price vs. the ZT. ZT may be a stretch - I could see that argument for an Elite. You could also look into the Samsung 8500, but again based price try the Panasonic VT60 - in the 60 inch size of course. Let us know how things go - I would also like to know the warranty you have so I can avoid it (maybe).
RIP Cricket - my pug and little buddy Jan. 10, 2017
Panasonic 60VT60 (cal by DNice)
Ascend's with RAAL, Love my PSA v1800 and a 7.2.4 speaker config, Oppo 203 w/ 2500+ blu-rays and growing. Yes I still have HD-DVDs too.