What Nickels Do You Keep?

Generally speaking when roll hunting, anything 1958 or prior. This is mostly because 1958 was the last year of the LWC and thus a good stopping point before the big climb of mintages, and also that my old 1993 Black Book stated 1959 as the beginning of the "Coins of these dates are not purchased by dealers". That said, I recently sold coins from this era on ebay about six months ago for only 1.5x face value, and because of this I don't hunt too many nickels these days. I would keep all S-mints/proofs (not 1968-70 non-proof strikes), War, 1955-P, 1950-P and D, 1942-D, all 1938's, all 1939's, and of course any Buffaloes or earlier. The problem with hoarding these are the fact they aren't worth too much given their weight and since I feel one coin with the best quality is sufficient, has made me move on toward Dimes/Quarters/Halves (I still like searching pennies on occassion). I would rather take my 1.3 average of silver dimes per box over a 1.3 average of silver war nickels/buffaloes per box anyday, as I found a 1943 Mercury dime the last time I searched a box of Dimes.

I keep all the rare ,low mintage coins in fine - ex fine condition.I even keep some 60-70-80's in uncirculated mint condition.Even tne 64 in mint condition.Their not worth anything now but in 10,20 years,who knows.

I usually keep all nickels that contain silver ((pre-1965)even though they are illegal to melt down), I also keep Buffalo nickels.

I keep the pre 2006 Jeffersons that I need to complete the set.

So I read what Yelimsexa posted... is that the main reason to save those pre-1960 nickels? Is there any other reason for that date?