Time Trial / Time Trialling / TT

Not really sure if i should post this here or in the Orient express thread. Im basically 3 years into Time trial and id like to get a new bike. My current alloy frame from the early 2000s has always been a bit compromised in terms of fit and is starting to show its age(spotted a crack-i could get it welded but id rather not chance it). I wanted to ask does anyone use one of the TT frames like the PDQ one Cammish can supply? they seem to be everywhere branded as all sorts of things including Vitus, scoperta, miracle, apollo, stevens and many more, its quite hard to tell if theres any difference in quality between them or if they are all based on hong/deng fu framesets and then branded up. That in mind they seem to retail around £800-1000 direct from china and then you may get stung for duty. Lets say worse case scenario £1200 all in is there any merit at all in buying one thats painted/finished properly in Europe and then sold at a hefty £1700? The reason i ask is i have been offered one at that price with a fairly flexible pay what you can installments but then i see bikes like the most basic Canyon speedmax is not that much dearer and you get a complete bike (training wheels/poverty spec with different geo,vertical dropouts etc) or something like a Trek/BMC on an interest free credit deal. My Boss is also into the sport and just bought a Shark TT as complete deal with the prolite 5 spoke and disc wheel for £2499- it seems to be a very similar generic frame but it has a different fork more akin to the Planet X exo3 which hides the front brake away under a fairing. I can also get either the Deda Flash TT (similar to a Dolan Scala) or flash 2 on fairly flexible terms. Two riders in my club have the Rose bikes Aeroflyer which is the same bike as the Deda Flash 2 but it costs a whopping £3500.