I have used:
TF&S Maris Otter: I think it is a very good malt, easily as good or better than the Muntons that I had used exclusively in the past.
Canada Malting 2-row: again a very good malt, I have used this in all my American style beers and they have come out great
Best Malz Pils: I have only used this once, beer came out nice and light, it is fully modified so a single infusion is sufficient.
If you are looking for more, you could look-up some of the group buy threads since NC is where most people buy. The folks around here have done 4 group buys (one pallet each time) in the last year, I have not heard any specific complaints about any of those products.