I would suggest Bento 4 and its partner iPad app. With the desktop app you can custom design what you want and sync it to your iPad. If the do-it-yourself route isn't for you (it's very easy, drag-n-drop) there are lots of pre-installed templates and a collection of user submitted templates available at the Bento website. You might find something close to what you want and then just make a few adjustments, add or delete a few fields, instead of building completely from scratch.
If you haven't already, get the try-me version of Bento and see if it will work for you.
I have not used Tap Forms so can't comment on it. I did experiment with Omnifocus a few years ago and found it to be nothing more than a glorified and expensive to-do list. Updates to the app may have changed this, but based on that experience alone I would never buy an Omni-x product.
Hope this helps!
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