From Epocware I use:
Handy Keylock - Best option for N80 since it includes the option to lock the keys when slider is closed.
Handy Alarm - Only Alarm with snooze and no MM key bug.
Handy Weather - Excellent app, love it.
Handy Taskman - I still prefer Best Taskman but I like that you can activate it by holding the menu key. If Best Taskman did this, I'd get rid of Handy Taskman.
Handy Safe - Definitely the best option for an app of it's kind.
If you're planning on putting Handy Clock on an N80 then don't do it because your battery life will suffer greatly. Other than that it's a nice app.
Bottom line is that all Epocware software is excellent. My advice: use the trial, play with the apps. You'll end up buying them.