Lighter rims and light pulley

[Foot]

These would be my next mod, hopefully before the end of the year. I am thinking of going with some 12lb rims to replace my 16lb steels. And going with the light pulley since everyone recently that installed it said it was a good install.
My question, I assume the lighter rotation mass on both would be a noticeable difference in the low range?
My KN intake and new muffler has given me more power in the 3K+ rpm range that I can tell.
Rims another 500 dollars and pulley about 150... well they will have to wait a little. Some of you guys do not care for my steels painted shiny black, with chrome looking beauty rings and a nice center cap.
Thanks for any information on the lighter mods and how they effect the torque and the low end. And any negative aspects of them.