What are good keylength for El-Gamal?
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This is really an open-ended question and it depends on what platform you want to use, your performance constraints, who your enemies are et.c.
The outdated GnuPG faq sums this up nicely on length of ElGamal keys - notice that GPG currently creates 2048 bit ElGamal keys by default.
xkcd #538 is also of relevance here. :-)
I suggest to have a look at this document from Ecrypt. It lists the the different key lengths in dependency of the required security level. http://www.ecrypt.eu.org/documents/D.SPA.13.pdf
There is also a short summary and key length suggestions from other organizations at http://www.keylength.com/en/3/