Two levels in Maneuver Master monk will give you Improved Trip and Combat Reflexes, without the need for Combat Expertise if you don't really want to take it. Sets you back one on BaB though. Really love the concept and the well thought out build. I'm unfamiliar with the Fury's feats, where are they from?
Have you considered the Bard class? It's like rogue, except better. The Archeaologist archetype most blatantly, but even normal bard does skills better and will allow you to buff your CMB a bit with inspire courage. And comes with whip proficiency.
Sandman Bard gives you SA and Trap finding, as well as spells etc...and the whip... not sure why, it seems a wee bit powerful
Well, Sandman bard is really strong, but will have a slower progression than the build outlined here. Also, he gives up his inspirational performances. There's no way a pure bard ever gets to Whirlwind Attack or probably even Spring attack. Also this has a much higher sneak attack potential. I might even suggest Combat Patrol for this build, with a high enough DEX and it seems like you're going DEX so it should be great. I think with Rogue vs. Bard is just depends what you want to do well. Sandman is obviously going to be more versatile with spellcasting, but if for some reason you didn't want to mess with that... the way this is set up looks really nice. Taking the one level dip into Bard, might be okay, if you go Fighter / Fighter the next two to make sure to pick up Whip Mastery at 3rd.
Traps can also be handled by Disable Device and Detect Magic & Dispel Magic.
Got AD&D/2E players in the group?
That is likely where the "we need Rogues for all the TRAAPPS!" thing is coming from.
Player 1: "Oh dear lord..."
Player 2: "The Traps man! They. Are. EVERYWHERE! EVERYWHERE I TELL YOU!"
I think some AD&D/2E players have what I call the "Admiral Ackbar PTSD" Syndrome.
Every time a DM describes a room, in a little too much detail, they cry out "IT"S A TRAP!"
I. LOVE. THIS.
More multiclassing!
Kensai Magus might be a good dip for you. As a rogue, it gives you access to a lot of rather useful spells (to use as wands/scrolls).
It also gives you in one level:
Weapon Focus
Exotic Weapon Proff
1 point of AC if possitive Int score (and wearing light armour)
Spell Combat (can cast in a pinch if necessary though you'll have few spells)
Arcane Pool for +1 enhancement to weapon as a swift action/1 minute
Gives you access to True Strike which is what you want for a sure Trip.
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Personally I love a few more levels in kensai for rogues, for extra attack (spellstrike) giving you more sneak attack and the Arcana to add your Int to your attack bonus for ALL your attacks that round.
How about Agile Maneuvers? Dex instead of Str to your CMB seems like something you really want. I see that Fury's Fall gives that on trip attacks, I wonder if the two feats would stack? In any case, if they don't, Agile Maneuvers would be just better for you since your STR modifier is negative.
Have you considered the Bard class? It's like rogue, except better. The Archeaologist archetype most blatantly, but even normal bard does skills better and will allow you to buff your CMB a bit with inspire courage. And comes with whip proficiency.I briefly thought about it, but I want someone who can also disable traps. Bards are a solid class though.
Edit: I didn't realize Bards could disable traps. That is interesting.
You can use detect magic to find magic traps and dispel to suppress them. Anyone can find and disable nonmagical traps.
And the Archaeologist archetype I mentioned actually gets trapfinding. It's not called trapfinding (and it's actually better; the bonus applies to ALL perception checks, not just to find traps), but it does the same job. Check out the archetype. Even gives you uncanny dodge, evasion, and rogue talents. It's basically a rogue with full spellcasting and self-buffing luck abilities instead of sneak attack.