Emirates Business Class on an A380 is apparently can't be beaten, but be sensible about where you fly. Flying to Dubai is expensive. But if you fly a bit further- Amman and Muscat seem to be good choices- you can do well. I've seen Gatwick-Amman in business class for about £800 each way.
I've been looking because I'm the same. Having flown economy on an Emirates A380, I'm dying to try business class. But probably can't justify it just yet.
We fly business on long haul for work but have only gone to Korea long haul so far...
Korean Air (ok but seats aren't the best at being best and it's always red hot, the toiletry bag is not too bad, food is OK, it's normally a 777 or poss A380 in the summer months between Heathrow and Incheon in Korea)
Air France (seat pretty good on the 777, wash bag was more style over substance and the food was good if you like posh nosh.. I believe it is some times a 380 between Pairs and Korea too)
KLM seats really good and works well as a flat bed, food is normally alright too, films not quite as good as say Korean Air but enough of a choice, KLM don't have any A380 but upstairs in a 747 is still rather nice as it's like your own private (ish) jet as there's only 30-40 people up there tops.
Emirates. This was a 380 between Dubahi and Korea and it was pretty good. Seat was not too bad and the extra memory foam topper they give you was good as well. The bar was nice too as it gave you somewhere to go and have a walk to, sit and chat etc. And the wash bag is another level! It's a huge thing with razor, shaving foam, deodorant, plus the normal tooth bush (larger tooth paste), comb, eye mask etc. It really can not be beaten.