Nice start to your app. I had a similar idea a few years ago which I never acted on. One thing you might want to do is categorize things by price. When I thought about this idea it was because whilst if I am going to buy an espresso machine I go out and research all the details and then make a decision based on many factors, most of my friends ask me "what is the best espresso machine under $500" etc. Whilst that doesn't apply to some things you have like banks, it does for most things people will buy.

Good luck, hope it works.