You didn't buy one yet? Honestly, just get a Power Mac G4. It combines the best of the eMac and the best of the B/W. It'll serve you better in that it won't be restricted to OS X.
Getting modern Linux working on the eMac is a tremendous pain in the @$$, if it is even possible (I'm not current). Even Debian 7 and 12.04 are subpar experiences, thanks to the CRT's ever-shifting geometry with no way to change it via software.
To be blunt, eMacs are great machines. The last model rivals low-end iMac G5s, while everything prior went toe-to-toe with the iMac G4s. But if you plan on ever running anything besides OS X, looking elsewhere is strongly recommended.
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I always loved CRT displays, will the later model Apple crt studio monitors work at least?