how to get money off for buying two?
Ask them how much they'll cost if you buy 20, if they say they'll cost £X each say "Great I'll have two at £X just now, and if I like them I'll be back for the other 18"
And in all seriousness, warrentee is everything. LCD TVs are throw-away technology compared to old CRTs. They are throw away technology compared to socks! I used them for exhibtions (LCDs broadly, not the one you are looking at specifically) and in every case have to replace broken down screens regularly, some only last a month. If theres four TVs in a show we'll always keep two in reserves and can expect to use those reserves, buy more reserves and use them too in a 12 – 18 month run.
I've got two, new, boxed Polaroid TVs sitting by my back door waiting to go to the tip, and one working Wharfdale one next to my desk just now that was the only one left working out of 6 bought for a 9 month exhibition (the show only used two screens)