For shear numbers I search dimes more than anything else. They are easy to aquire in large numbers,they are fun to search through, I always find keepers, and they are easy to dump.
Halves is what I'm primarily looking for though. I won't buy boxes because because I get way too many skunks , and dumping can be a problem.
I might do a box of nickels a month. I've become bored with them lately, and probably won't search them anymore.
Lastly I'll buy bags of quarters. I've only gone through about $3000.00 this year. I'm going to do more quarters in the future.