I will be following your thread with interest... I am looking to retire in 5 years at 45 years of age. Alas, we still have a pesky mortgage... we are trying to decide whether to pay it off completely in April, or take advantage of the low rates everyone else (except us) is enjoying these days. We have the cash saving to pay it off completely, but I find much comfort in keeping a heavy cash component to my assets.
Looking at your numbers, you seem to be on track... on one income no less!!! We defnitely need both our incomes to get to our savings goal 5 years from now.