RCA made some good ones too. Since they're not as popular, nor produced in mammouth numbers like the forementioned Zenith, you can find these priced reasonably at antique radio meets. I have an RCA 6RF9 I picked up at Kutztown a couple of years ago for $10 that kicks ass.
(Not mine, but here's what it looks like):
http://radioatticarchives.com/radio.php?radio=2565