If you want a good practice, you could also get one of those brinks padlocks, full of security pins, not a bad challenge either, oooh or you can get a best cylinder and it will be a good practice to pick in to open it, and for a challenge you can try picking it at the second sheer line to remove the core
abloy and kwikset are good options too
though if i had 25 bucks, and i do, i would (and if rai contacts me, will) send them to raimundo, to get "hooked up" with some tools. Respect Rai, you make some awesome tools

Let the picking begin...