Since you are familiar with the Dave Ramsey plan- I would walk up the baby steps.
1) Sell the Tahoe if you have to take a bit of hit-do it- I would drop it to 30k now. Once less hassle you have to deal with. also check out
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2) I would drop the 401k down to the match of 4%
3) Once you get the cars paid off hit the student loans-get that off of your back.
If you wife is going to be leaving work-I would then tacke a 6 month Efund to help with going down to a one income family.