Ok so i will be running a 3.5 dungeon crawler (that miiight become a full blown campy in the future) and i have the dungeon full of traps and puzzles and monsters... but the BBEG is giving me some trouble

the players will be 3 newbs and 2 that have played before (not alot by many standards lol)

although i'm not sure what level they will end up being i think it should be around 15-20 (they are starting out as 5th level)

so should i just go with something basic (like an ogre that uses physical attacks witha couple minions) or should i go with sometype of caster with lots of minions?