There are many choices for both bottom spacers and top, both will net you the level you want, and they're all in the same price range. The Rough Country 2" spacer is probably the most popular bottom one while the 2.5" CCM is the most popular for top spacers. With the CCM, you need to trim the bolts and swap struts side to side which is kind of a PITA. Recently, many have been getting the Top Gun Customs kit, it's a top spacer that doesn't force you to swap struts side to side or trim bolts. If it were my preference, I'd get the TGC kit.
Here's a link to the TGC: http://www.topguncustomz.com/Store/G...view=238695097
Here's a link to the CCM: http://www.ccmoffroad.com/shop/index...ct_detail&p=23
Here's a link to the RC: http://www.roughcountry.com/chevy_4wd_leveling_kit.html
Remember to do an alignment after you install whichever one you pick
2001 GMC Sierra SL ECSB - Project
2012 Honda Civic Si - DD
2009 GMC Sierra SLT ECSB - Sold