For 90% of my camping, I use a basic REI Quarter Dome T3. I've got 60+ nights in it, and it has really stood up. I'm pretty sure Sierra Designs makes REI's tents.
It's cheap, it has aluminum poles, color-coded to ease in late-night assembly, a stuff bag that is almost twice as big as needed with compression straps (why doesn't everyone do this?), clips to snap to the poles (rather than fabric "tubes" you have to push your pole through), a matching footprint designed specifically for the tent, and replaceable parts. For me, the best feature is that it's free-standing; meaning I don't have to use tent stakes if I don't want to. It has held up remarkably well, and the only downside is that it gets condensation on the inside when it's humid and I don't stake the vestibules out. If I were to modify it, I'd make bigger vents for more airflow.