Beguiler spells
--Vanye--
I don't have the Beguiler spell list in front of me, but using the spell filter ability at d20srd.org (
http://www.d20srd.org/filters/spell.php), I come up with 5 1st level Illusion spells:
Color Spray, Disguise Self, Magic Aura, Silent Image, Ventriloquism.
Unfortunately, all of these except Ventriloquism are already on the Beguiler list.
I just went through the same agonizing decision with my level 3 beguiler. I eliminated most offensive spells, or spells requiring a save, since the DC of a level 1 spell won't remain great for long. You get very few chances to expand your spell list, and I wanted something that would last for much of my career. YMMV
Here's my "short list":
* Friendly Face (SC): +5 to Gather Information and Diplomacy.
* Instant Diversion (Races of the Dragon). Swift spell that creates illusionary doubles that split up and run in different directions for 1 round.
* Net of Shadows (SC): Grants concealment to a number of creatures for 1d6 rounds.
* Serene Visage (SC): +1/2 levels to Bluff, which synergizes well with your Beguiler abilities.
I ended up taking Instant Diversion. As spontaneous casters, Beguilers can't quicken anything, so Swift spells are really helpful. It duplicates some of the functionality of Greater Mirror Image (a 4th level spell you get later), but has the advantage of letting you create images which run *away* from you. Better than mirror image for drawing critters away from yourself.
The buff spells really appealed as well, but this fit my character's personality best. As a few other already pointed out, there's lots of options, so it really comes down to finding something that fits your character. Good luck!
-Shaele