I believe what B480 is saying is the the Bilstein 5100's will extend 2" further than the stock shocks, thus giving you more travel. This does not give lift, it simply effects the length that the shock will extend (flex).
You are right on the adjustment/spacers needed.
Anything 3" and under should be fine, plenty of guys have been running this amount of lift for quite a while with no negative issues. Alignment is recommended for sure, and bigger tires finish off the look.
Here's a good writeup on the swaybar bushings.
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