Here we will provide you some information about weapons in Rappelz. Please have a look.

In this game, you can buy an r2 mace when you reach level(rappelz rupees) 20 if you like, but you could just get by with your r1 mace for a few levels also. You won't be needing a mace after level 25, so the only important thing is to have an r2 staff ready. When you go into a dungeon, don't take your mace, you should never, ever be using it.

As far as using strike cubes, it's not a bad idea, but it's not a priority. It's more important how you heal and that you sit often, use deluxe spell potions, and so on, than how much you heal for. Don't dump a ton of money into getting a super staff and then fail to use deluxe spell potions. One strike cube could pay for 44 hours of keeping deluxe spell potions on.

And higher cast speed does a million times more good to you than the benefit of a single strike cube. But if you have enough rappelz gold, then yes, it's good to use some. Over +4 is just if you're bored or want to try making a really killer staff for your DM or something, though you don't need a +8 or +10 staff, even if it would be 'nice'.