So I'm going to be making this circuit next. I'm back in electronic technology class so I get to make more of these

Instead of just doing 1 circuit this year I'm hoping to do three. This one, one my teacher gave me (This one is Surface Mount Technology so I might start working with those soon), and another one from this site. I'm not sure which one I should do next? Any recommendations? Nothing too hard

I'll post my CAD drawing of this circuit tomorrow when I'm back in that classroom. It's already finished and all I need to do is design the next circuit so we can make all three of them at once to save time and not have to go through it all over again