hisense have decent picture quality but look into reviews about their support, they are often a nightmare to get any issue sorted. new series of many tvs have just come out so prices will be high on new models. november time they tend to drop a little.
looking at the jvc you listed like any review look at them all. some say its okay some say its terrible rating 1/10. that is the problem with so many reviews now days.
well I actuall bought the jvc and it seems great...the 4k ultra videos i have watched on utube are fantastic....would have prefered a lg or a samsung but my budget was too low...got the 55inch jvc for £425 so cant complain.