My phylosophy on Beholders is kill them FAST. While with many monsters it's ok to cast support spells in the middle of battle, use defense, and perhaps have ranged attacks which minimize the monster's ability to hit you, with Beholders, the faster you can bring them down, the better. It's all about offense with them, I think. So, rush in with your fighters (perhaps on speed), cast fast, impactful spells (flame arrow comes to mind), and try to eliminate them before you take too much damage.
That approach works well with one or two beholders. With many beholders waiting for you, I have to admit that my favorite method is a little on the cheese side -- I sneak in with a thief or someone invisible and then throw in a few fireballs from mages that cannot quite be seen by the beholders. That weakens them enough for me to take them out quickly with my fighters.
In a Beholder lair, I also think it's critical to keep one character invisible and on the outskirts of the battle to see if any other beholders are coming to join -- intelligence is key (a wizard eye works too, I think, but I don't use that much -- yet).
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