When you find a bike with a comfortable top tube but the handlebar is still too low for you. Still consider getting the bike. You can raise the handlebar A LOT with a stem called Nitto Technomic for threaded headsets(old style) or if you are getting a bike with the modern 1.125" headset, there's an adapter that will raise the height of the stem. a company name dimension makes it. It is called a stem riser.