The general advice is to avoid buying large screen CRTs mail order.
Try and obtain the best price match you can from "bricks and clicks" online dealers. Buy the set you like from John Lewis or similar.
This will ensure the set is installed correctly without hassle to yourself, performance and connection will be optimised and of course the five year guarantee to provide long term service support.
If you buy mail order or from the back of large white vans obtaining service attention may prove tricky, manufacturers refer you to independent retailers with on-site service, in turn they will refer you back to whoever sold it to you, hence further swap outs.
It's up to you