I grew Celebrity for the first time last year and was not at all impressed... a LOT of the green tomatoes just dropped off the plants for no apparent reason (that didn't happen with any of the other varieties that I was growing). And, I didn't think that had that much flavor when they did manage to stay on long enough to ripen.
My favorite hybrid, large, red tomato is Country Taste -- big juicy slabs of tomato for BLTs... yum! My favorite yellow tomato is Djena Lee's Golden Girl -- much better flavor and texture than Kellogg's, IMO (even though I REALLY wanted to like Kelloggs...).
Aunt Ruby's German Green and Mexico Midget were at the top of the taste trials at Seed Savers Exchange last year -- I'm trying both of those this year.
So, Paul, you've probably figured out by now that the tomato that you're going to like the best is very subjective! For me, if the flavor is described as "low acid" or "mild," I now steer away from it -- apparently I prefer more of an old-fashioned type. And I'm also pretty sure that the climate where any given variety is grown makes a difference as well. I hope you find some that you love!!