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Depends on how much you want to spend and if you choose to do it correctly. Tons and tons of threads on here.
Do you just want to throw HID bulbs in your existing lights? What are you driving? If you don't have projector headlights, you should get some. If you don't, most of us won't want to help you blind the rest of the world.
http://www.ebay.com/itm/00-06-Subur...&fits=Model:Tahoe&vxp=mtr&hash=item2a122167dd
Depos are a very good price ^
http://www.ebay.com/itm/SUPER-Slim-...Parts_Accessories&vxp=mtr&hash=item3cbe2c988f
I run these HIDs, I have DDM on my motorcycle but I like the Xentecs on the Tahoe. They seem the exact same to me. I have talked several buddies into the Xentecs over DDM. DDM was terrible on shipping times. Xentec was there in 3 days.
So you're looking at less than 175.