Stay with 12 monk at least. Can go 12 monk 8 rog, but the skills can be there. The ninja spy 2, at 12 gives the improved crit shortsword in addition to Touch of Death (granted at lvl 9)
The spot required to see most stealthed mobs is less than max. Personally I like Spot, and max it out... but it is possible to save a few points in spot. You will see little difference from 20 ranks in spot to 23 ranks in spot.
With the Monk levels (5/lvl, 6/lvl after lvl 7): Conc, Hide, MS, Spot doesn't leave much left over for Search, Disable and UMD.
Rogue levels (9/lvl, 10 after lvl 7):
Mallets, the only way you can really fit in all the skills is this progression:
Code:
Level 1 (Rogue)
Skill: Balance (+4)
Skill: Disable Device (+4)
Skill: Hide (+4)
Skill: Jump (+3)
Skill: Move Silently (+4)
Skill: Open Lock (+4)
Skill: Search (+4)
Skill: Spot (+4)
Skill: Tumble (+1)
Skill: Use Magic Device (+4)
Level 2 (Monk)
Skill: Concentration (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Level 3 (Monk)
Skill: Concentration (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Level 4 (Rogue)
Skill: Disable Device (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Search (+2)
Skill: Spot (+1)
Skill: Use Magic Device (+2)
Level 5 (Monk)
Skill: Concentration (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Level 6 (Monk)
Skill: Concentration (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Level 7 (Rogue)
Skill: Disable Device (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Search (+2)
Skill: Spot (+1)
Skill: Use Magic Device (+2)
Level 8 (Monk)
Skill: Balance (+1)
Skill: Concentration (+2)
Skill: Hide (+1)
Skill: Move SSilently (+1)
Skill: Spot (+1)
Level 9 (Monk)
Skill: Balance (+1)
Skill: Concentration (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Level 10 (Rogue)
Skill: Disable Device (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Search (+3)
Skill: Spot (+1)
Skill: Use Magic Device (+2)
Level 11 (Monk)
Skill: Balance (+1)
Skill: Concentration (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Level 12 (Monk)
Skill: Balance (+2)
Skill: Concentration (+1)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Level 13 (Rogue)
Skill: Disable Device (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Search (+3)
Skill: Spot (+1)
Skill: Use Magic Device (+2)
Level 14 (Monk)
Skill: Concentration (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Search (+0.5)
Skill: Spot (+1)
Level 15 (Monk)
Skill: Concentration (+1)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Search (+1)
Skill: Spot (+1)
Level 16 (Rogue)
Skill: Disable Device (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Search (+3)
Skill: Spot (+1)
Skill: Use Magic Device (+2)
Level 17 (Monk)
Skill: Concentration (+2)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Search (+0.5)
Skill: Spot (+1)
Level 18 (Monk)
Skill: Concentration (+1)
Skill: Hide (+1)
Skill: Move Silently (+1)
Skill: Search (+1)
Skill: Spot (+1)
Level 19 (Rogue)
Skill: Disable Device (+4)
Skill: Search (+2)
Skill: Spot (+1)
Skill: Use Magic Device (+3)
Level 20 (Rogue)
Skill: Disable Device (+2)
Skill: Search (+1)
Skill: Spot (+1)
Skill: Use Magic Device (+6)
Ninja spy adds a +4 bonus to balance, hide and move silently so can skimp on those a little. The 8th rog is needed to max out your essential skills. I am actually making a 13/7 assassin but didn't bother with Search and disable. You have caused me to reconsider... I might LR when I cap out my current incarnation which is halfway thru a TR.