I've had every Earl Grey I've been able to get my hands on in this country. The first thing I do whenever I visit an immigrant type store where they have stuff from abroad is look for any earl greys I might not have had yet. I've had some delicious ones. The best are of course not the bagged kind, but I quite like the simplicity of bagged teas, so I give'em all a chance. I recently had a very good cup of Victorian Earl Grey from Celestial Seasonings that were individually sealed (one bag per air proof foil wrapper) which was brilliant, but I'm pretty sure they don't make them anymore. The regular Twinings Earl Grey is everywhere, cheap and also quite good in my opinion, but it's flavour is just a bit too light. One of my favourites which is easy to get a hold of and very cheap (at least here) is Ahmad's Earl Grey.
Nice and flowery bergamot flavour, not too weak - and it's not very bitter either should you forget to fish your bag out or like to leave it in for a bit longer. Recommended