What hacker-friendly personal finance managing software is out there? Mainly what I'm interested in is:

* Being able to set budgets as percentages of my income * Being able to Play around with those budgets to see how a new expense would affect everything else * Having credit card purchases automatically tallied into the correct budgets, so I can see how much room I have remaining in each * Being able to access this data from mobile, so I can consult it before making a purchase

Do you know of anything that fulfills some or all of these goals? Or is there anything else that you particularly like?