I have a 5wt that I use for most everything. I have thrown 2/0 streamers to snook and caught one. Last week I caught a trout on a size 28 spinner pattern. I might be wrong in using it for all these different size flies but I have had good luck. If the wind is up I will use an 8wt for larger flies but the 5 wt does good for trout flies of different sizes.

Jim