HomeBudget allows family sync - and you don't have to use wi-fi to keep different devices up to date - it will work over the air on 3G. It's very nice, and has an absolutely wonderful Calendar View ( or List View, your choice ) of re-occurring bills that are coming due on the next month.
I really like HomeBudget a lot. Of course it has customized budget planning, with another nice feature for those that are new to budgeting. You can perform the simplest kind of budget possible. You can say, keep all my spending below X dollars for a given month. Or you may go as detailed as you like, with categories and sub-categories and budgeted amounts for each.
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I also like iCompata. You may suffer through the documentation ... but the software is really incredible. This is the only budgeting software that you can pick your major bank when you set up your account. It pre-fills in your banks server URL and attaches that with your account. It has an internal browser that you can navigate to your bank's web site and log in. If your banks has a website whereby you can download your transactions in Quicken or MS Money format, then there is no hand entry required.
This also has some UK overtone functionality that may be useful for college age roommates or something. It has the concept of creating special "People Accounts" - which as near as I can tell, allows complex multi-person purchases to split responsibilities and tracks an overall net balance between people. Kind of handy, I guess, being married and settled myself, I have no need for this functionality ... but I thought I would mention it as well.
Anyway, these are some of the best budget - bank finance apps that I have tried.
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best of luck with whatever you decide.