I changed my rotors on my 08 Vert to Euroteck drilled and slotted and weighted them at 17lbs each for a total saving of 35.6 unsprung lbs over the stockers.
Got the 6 spokes wheels from an 09 and measured 17.2 lbs reduction vs the stock 5 spokes, same PS2 tires.
KW2 coilovers suspension, with 18 firmness settings and 1 1/2" of height adjustablility also save 8 lbs total.
Got the 1" lowering kit for the driver's seat wich weighs 8.5 lbs vs the stocker at 13.5 lbs, so another 5 lbs there, I wont do the passenger's seat as my wife is only 5ft.
I also got an Odyssey 925 battery wich weighs only 25 lbs and cranks fine, I also used it for over a year on a SRT8 Jeep.
I've read that Belanger headers save 20 lbs over stock.