You need about $42k discretionary cash plus insurance, maintenance, storage and gas - you can have it all saved or at least budgeted as part of your spending plan for the next 3 yrs, 10 yrs, 20 yrs, etc.
How much you make is not the answer since the new American Way of using credit puts most into "the more you make the more you spend" which is usually above your means and the desire for creditors.
Making more money is the usual desire but is difficult if not impossible for most - the real trick is spending less or dare I say wasting less - do you know where your money goes?
Years ago people bought what they could afford - budgeted items in envelopes/jars/etc. - when it was full enough, they bought that item.
Envelopes has graduated into the 21st century
http://www.mvelopes.com - take a look at it - it may help you, it worked for me.
Eric