Monroe Reflex. These will stiffen up the ride some so you don't get the side-to-side roll that oem shocks allow. You can get them for roughly $40 each I believe. Plus Monroe is running their usual deal in October where if you get a whole set you get a $60 rebate. Try rockauto.com.
I've had these for about two years now, on my 04. It's a 4x2 and I do on-road driving only. They've been serving me well.