Hey all i need some advice, help, and opinions on the 04 gtp again!

So I've been researching and doing my homework on the suspension for a little over a week. I'm trying to find something along the lines of rear sway end links, or some bushings that will make a noticeable change but won't break the bank. I'm posting on here for any and all idea's, wouldn't really like to change my sway bar...but like I said listening to all idea's. I'm a newb when it comes to suspension! Thanks in advanced!

Anybody??