Not sure where you're located, but a Kobo might be a good option for you to check out (tough to find in-store in the U.S.). With the built in fonts you can adjust the weight and make them thicker/darker. Or if you don't like any of them you can add a font that works for you with a simple drag and drop onto the device (with no jailbreak etc required and you're putting onto the device once, not into each book). There are 20 some size settings so mostly there isn't a big jump in size which lets you get pretty close to your sweet spot if not hit it. All of the newer Kobo devices are touchscreen so it doesn't help you on that front.
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