You can probably find an Angeling for around 10-12 mill. Infact there's a Fullplate being sold right now
in prontera.
http://pc.bot.nu/prontera/index.php?match=%25angeling%25&Submit=SearchOther then that; like UV said; you'll want cast Reduction gear, such as Berze clips; those however cost
closer to 15-18 mill; so you'll have to save up for a bit. After that; and if you're still Niff'ing with your Sader;
You'll want to invest in some Samurai cards. I think the best possible Carding for Grand Cross is an SSS +10 Saber
(Triple Samurai) However that's extremely expensive to make; and not really worth it overall.
You may instead try for a DBSS Mace, when you have enough. The Samurai cards will ensure you get more attack for
your Sader, and you'll be able to use it for a Blacksmith/Whitesmith too in the future. That will run you closer to 50-65 mill though,
so it'll probably be a while before you're able to afford a good weapon (If you don't have one already)
If you're strapped for zeny; some good weapons that spring to mind are:
Cutlus: 150 Attack
Excalibur : 150 attack; + 5 int (Quite good)
Haedonggum [1] with an Andre card. (attack + 20)
Saber [3]: With Andre, or other helpful cards