Semi-class suggestion

Cat Burglar

Requirements: 10 Rogue levels

Level 1: +2 Hide +2 Move Silently +1 Open Locks +1 Disarm traps +1 Search +1 Spot +1 Climb +1 Jump
Infravision
Level 2: +4 Hide +4 Move Silently +2 Open Locks +2 Disarm traps +2 Search +2 Spot +2 Climb +2 Jump
Darkvision
Level 3: +6 Hide +8 Move Silently +3 Open Locks +3 Disarm traps +3 Search +3 Spot +3 Climb +3 Jump
See Invisible 3/Day
Level 4: +8 Hide +8 Move Silently +4 Open Locks +4 Disarm traps +4 Search +4 Spot +4 Climb +4 Jump
Elven "no movement penalty for searching" or "Search always on" feature
Level 5: +10Hide +10Move Silently +5 Open Locks +5 Disarm traps +5 Search +5 Spot +5 Climb +5 Jump
HIPS

A possibility. Well, not the "always on" active searching (that's a hardcoded thing for elves), but maybe the other stuff.