What about a non-"noob" build? 
Technically, there is no such thing as Noob Build, some people just call it like that for some reason
Oh I see xD So you're recommending the SB build? =x
Yeah, SB is the SinX's strongest attacks if used with the right stuff
Could you elaborate a bit more on the "right stuff"? =x And this is keeping in mind that I'm currently playing on a server with max base lvl 350, max job level 130, and max stat 255 right? Although I'm planning to move to iRO after I have a better overall sense of the game lol. Thanks very much for your time and patience, and sorry to keep bothering you with noob questions ;x
It's mainly because most SinXs on HRs really don't pay attention to what they are doing, I mean, they will always either enchant poison or nothing, thus, making the damage ridiculous with SB against a DV/Thara/ED user, another thing is that they tend to sneak up solo on random people, stupid assasin crosses won't even think about getting themselfs buffed unless it is done with EDP, they sometimes also have the tendency of just going outright in PvP without obtaining the Sonic Acceleration quest skills first, they tend to only get it from a Platinum Skill NPC, I suggest this for a SB build:
1) Make sure to keep your STR at multiples of 10, (Bonus and Base)
2) Use a +10 Triple Bloody Boned Various Jur
3) Carry one of each elemental armor (Wind, Fire, Water, Ghost, Poison, Undead and Holy armor)
4) Use Cursed waters or have a friend Sage/Priest enchant your weapon
5) If you have a SL friend, than ask him to Spirit of the Assasin you
Usually, this is what most good SinX users wear and use, you should ask someone who's main character is a SinX