First off, aluminum that is heavy gauge works well, I know several people who have had them for years and they are holding up very well. Stainless is a bit heavier but will definately last longer if you are in really nasty territory, ie hunking rocks and stuff a lot.
#2 screw the hand scoop. TRUST ME, especially if you are in coquina and hard pack, why bend over and hammer hammer pound dig dig to get a hole dug, putting all the stress on your knees and wrists to dig a hole when the sand is not soft. Get a scoop that is on a pole / stick / whatever you want to call it. Once you get one you will never go back. Especially if you are older like me and have knee / back / ankle / wrist problems. Stick the scoop down, and let your weight do the work, stick it in the sand and rock it back and forth while either stepping or halfway standing on it, and the scoop does the rest. Pop it out, thump it, dump a wad out of it, swing, no beep, dump another wad, swing no beep, dump another wad.. or dump it all and cut in half a few times then snatch your find up with the scoop bring it up to your waist and pick out your coin. NO bending.
Its quick to learn and you will do a lot less work with it. Just drag it behind you. I have a heavy duty aluminum one, sorry I do not know the brand name, a friend picked it up for me at the daytona shootout earlier this year and it works like a champ.
aaron