Basically any high end crt "should" work fine, there appears nothing from the spec sheet that demanding. Often such second hand units are given away these days.
the £2000 quote is fair enough, crt's are now really only required for specialist applications, as the demand is so limited new items fetch a premium. It's clear from your vagueness that this is probably for a high end business application, and not just a mates pc. Perhaps just being upfront will allow us to provide you with the correct info.
I doubt you will find anything new from the regular outlets that does the job which is new, unless you are lucky enough to find someone who has old stock.