The best leveling kit is the one that costs the less. All they are is a spacer. I got my Daystar 2.5 off of ebay for $25.
07 Scab XLT 4x4 5.4l Flex. 2.5" Leveling Kit, 35x12.5x17 General Grabber AT2, Tinted Windows and Edge Evo Programmer, Smittybilt Light Bar with 4 -100w Pilot 6in Lights