Here's my take:
[FONT="]Beholder CR 13[/FONT]
[FONT="]LE Large Aberration[/FONT]
[FONT="]Init[/FONT][FONT="] +6
Senses darkvision 60 ft.; all-around vision, Perception +26[/FONT]
[FONT="]DEFENSE[/FONT]
[FONT="]AC[/FONT][FONT="] 28, touch 12, flat-footed 25 (-1 Size, +2 Dex, +1 Dodge, +16 natural)[/FONT]
[FONT="]HP [/FONT][FONT="]181 (19d8+95)[/FONT]
[FONT="]Fort [/FONT][FONT="]+12 (1 reroll/day),
Ref +8,
Will +15 (1 reroll/day)[/FONT]
[FONT="]OFFENSE[/FONT]
[FONT="]Speed[/FONT][FONT="] 20 ft.[/FONT]
[FONT="]Melee[/FONT][FONT="] bite +14/+9 (2d4)[/FONT]
[FONT="]Ranged[/FONT][FONT="] eye rays +16 ranged touch (DC 22)[/FONT]
[FONT="]STATISTICS[/FONT]
[FONT="]Str[/FONT][FONT="] 10
Dex 14
Con 18
Int 17
Wis 15
Cha 16[/FONT]
[FONT="]Base Atk[/FONT][FONT="] +14;
CMB +15;
CMD 27[/FONT]
[FONT="]Feats[/FONT][FONT="] Alertness, Great Fortitude, Iron Will, Agile Tyrant (from LoM), Wind Stance, Toughness, Improved Initiative, Improved Great Fortitude, Improved Iron Will, Dodge[/FONT]
[FONT="]Skills[/FONT][FONT="] Fly +25, Intimidate +24, Perception +26, Stealth +24, Spellcraft +25, Knowledge (dungeoneering) +25, Knowledge (arcane) +25[/FONT]
[FONT="]Languages[/FONT][FONT="] Common, Undercommon, Draconic, Infernal[/FONT]
[FONT="]SPECIAL ABILITIES[/FONT]
All abilities as standard Beholder in MM, except eye ray DC 22