to lift or to level?

I have a 2002 Chevy Sliverado LS Ext Cab 4x4. 5.3L v8. The previous owner put on Dick Cepek DC-1 ploished aluminums (16x8?) wrapped in Goodyear Wrangler Pro-Grade Silent Armor (LT 285 75 R16 Load Range E). Nice looking rims and tires, but to accomadate the rims & tires, the torsion bars were cranked all the way up. So, instead of the stock Chevy slant (lower in the front), the truck sits level. I didn't notice the harsh ride until I started commuting to work everyday. I've been talking to a local custom shop and they are telling me to do a complete suspension kit (keys in the front with new shocks, blocks in the rear with new shocks, alignment). Others I have talked to say a leveling kit will cure my problem. Which way do I go? I've never had a 4x4 pickup, so I need all the help I can get. Thanks    
 

the keys are just a leveling kit... that'll give your good ride back..

you won't need any rear blocks unless you go more than 2.5" in the front.


this is what I use frequently.... about 3 a week..

http://readylift.com/

an IFS suspension lift will only gain more height you don't need for 33" tires along with a high installation cost.  
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see me at robsoffroad.com

id go with the blocks. gives you better stance.and overall better ride