I think it's time for a new weapon. This drakes sword is starting to suck ass. Just beat Ceaseless Discharge the normal way. woot.

Try forging a Lightning weapon. Those things destroy pretty much anything, PVE and PVP. Or a Black Knight weapon is also a very powerful one.

just cut seath's tail off.. a huge dissapointment, since i did it second try. (Died on the first, since there isnt a fog gate before the fight was triggered once.. which led to thos guy's normally infront of it chasing after me and getting on my nerves when the battle finally started.. xD)

The stuff below in that lava shit after you beat ceaseless is just wow >.>

I find the grave lord sword upgraded to +5 is lethal, I just completely destroyed
Anor londo boss (Smough and ornstein) on my first attempt with it.

The Gravelord Sword is a Curved Greatsword right? Might try it out once I join the covenant.

What is the best weapon to use ?

Right now I'm using Black Knight Sword+4 , giving me about 370 Attack power. And I have 10 Twinkling Titanites laying around .

Still haven't fought Smough and ornstein ( i know, I'm really slow )

It depends on your playstyle. I'm still quite fond of my Black Knight Halberd +5, which has 490 Attack power. It attacks fast and has a wide horizontal range on each subsequent attack. Although, the damage has been getting lower and lower in NG+, so i've been switching to my Lightning Shotel + 5, which has 535 Attack power (split between physical and lightning), which attacks much faster, costs less stamina and can go through shields (even in PVE).

Dexterity builds usually focus more on faster, shorter weapons. Strength ones on hard-hitting but slow weapons. 

I'm building my STR more than anything else, but unlike you I'm also spreading the love between Endurance and Vitality at the same time

I was just reading about the Faith build, seems very good. Divine weapons with 50 Faith = win.

All these Black knight stuff, is there a palce with re-spawning black knights ?, I only have the sword .

Faith builds are pretty good, especially since there are actually good miracles to back up such builds on Dark Souls, unlike on Demon's Souls. Me, I prefer chaos pyros with my str build coupled with the Channeler's Trident. Couple that with a Hornet Ring and you get backstabs of up to 3K while the chaos pyros even make PVP players have to deal with lava dodging which leaves openings in their defense.

The final stage is comprised entirely of Black Knights, all of them respawnable and with all the different Black Knight weapons.