It's interesting to see the different opinions here. It's hard to argue with the success of the RE20. It's a great mic. As far as the lifetime warranty is concerned, I had to spend $200 on mine a number of years ago. It was dead.
I just bought a used, mint Heil PR40 with shockmount for $200. I wouldn't hesitate to use a PR40 anywhere I'd use an RE20. The AT2020 is a great mic for the money. (If you buy one, invest in a Samson SP1 shock mount. It works well.)
If you want to go cheap, you can get an MCA SP1 condenser mic for $49 shipped. You would be pleasantly surprised at how well the mic works for voice. Heck, at that price, buy one and try it. If you don't like it, pitch it.
It's really hard to find one mic that fits every application. A long time ago, I was in a studio where Charlie Van Dyke was using an MD421. It sounded great, of course. For voice-over work, for the right voice, you can't beat a Sennheiser MKH416, although I've never seen one used on the air. A Rode NTG-3 is a good alternative.
Maybe there's something wrong with my SM7, but I don't like it at all. It's not any better than an SM57 to my ears. Then again, I don't like an RCA 77DX or 44BX for radio. I sold mine.
There is a rash of cheap condenser mics with Chinese capsules, and they're pretty impressive for the money. They're not consistent, but my tube Aphex 460 is excellent. It has one of the best built-in pop filters I've seen on a cheap ($200) mic. It also requires a 5-wire cable and connectors.