If you are running stock bars with the stock bar weights I doubt there is any advantage in changing them - you'd be better off putting on some new grips with thicker rubber as the stock ones are silly thin.
I found the stock bars offered very good vibe dampening - well in the two days they stayed on my bike! worlds weirdest bend IMO!
Alloy bars will alter the vibe but without bar end weights it will still be there. You are on the right track looking at stainless steel weighted bars - don't be fooled by any of the pretty coloured alloy ones - they offer nothing in vibe reduction due to their light weight.
I've got alloy ultra lows, bar end mirrors and I made some stainless steel bar end weights from a piece of 30mm round solid - machined to 35mm long, bored for the bolt and rubber retainer like other end weights, I find the bars are vibration free.