I found Eureka not that hard at all! I'm through it without dying once, without using MP (sept for bosses) without using all my Highpotions and without all that big damage. I now have 2 Ninja's and 2 Sages and I only need to defeat Guardian for Ragnarok. My money is now reduced to 1 000 000 because of buying some things for my Sages.

Well, maybe I should go through Eureka a couple of times to lv up and get money. Oen battle regulary gives me 10 000 gil. ^^ So after 100 battles, I can buy 10 Shurikens. ^^"

Now I'll defeat Guardian, get Shurikens and then Sylx Tower awaits.