So ive decided i want to add a twsbi to my collection. Ive done all the research i can on the models but still undecided... I like the diamond 580 in rose gold and the vac 700, so its between those two... What are your thoughts? They are both the dame price. I havent been able to find a dealer that sells the rose gold nib units though... I dont have any vac fillers and the only piston fillers i have are noodlers.