I talked to the Tour Ice folks in Orem. 10 lb block of solid ice for $1.25. But I'd have to drive down to Orem to get it, as they don't distribute to any stores in the Salt Lake Valley. Darn, back to making my own blocks I guess.
I tried the frozen water jug thing once. It kept my cooler cleaner & dryer, but the ice didn't last as long as the block ice. And NO, let's not get into the draining vs not draining the cooler discussion again. It make's my head hurt to remember the #900 post, never-ending dialog from last summer. PLEASE, let's not go there again.
As for the OP's original question. I'd say, buy the sturdiest cooler you can afford, that fits your needs & frame, and treat it well. If you can afford the high end ones and they fit your rigging scheme, then go for it. But just know that they aren't the only way to go.
KJ