I have a Netgear GSM7224 Layer 2 managed 24 port 1GB switch for sale. You can see it here https://bitcointalk.org/index.php?topic=7216.1260
This is probably overkill just for mining. I found myself never using any of the features this has. I went with a more efficient unmanaged switch to replace this. Keep in mind it is a rackmount model so the sound of the fan can get annoying after a while if you are trying to work nearby. It has the rackmount ears on it as well.
I have not had any problems with this, willing to sell for $100 worth of BTC plus shipping.