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Weller Special Reserve is their 90 proof entry-level offering. Inexpensive and great for making cocktails/mixing, but imo not ideal for drinking neat.
Old Weller Antique (107) is their higher proof offering, and supposed to be a shelf staple. Very good, especially for the retail price (mid $20s), but not the nectar of the gods. Still, very good. Before it was difficult to find, I'd always have a couple bottles on hand.
Weller 12 is their older 12 year 90 proof offering. Supposedly the highest end regular release from the label. Again, it's good, and for the retail price it's a great daily pour, but at the prices it commands nowadays on the secondary market, there are plenty of better things that are generally easier to find (Four Roses private selections, Russell's Reserve, etc.) and for less money.Warning: Spoiler! (Click to show)
William Larue Weller is the Buffalo Trace Antique Collection offering at barrel proof (60+%). It is a very limited release, released once a year, and pretty darn good. One of my favorite pours, but I will say that it isn't worth the price it commands on the secondary market.