Your limitations are primarily dependent on how many skill points you have and where you want to spend them. Some skills have hard caps on them, like Jump. Others are more easily boosted with gear swaps, like Open Locks.
So, while there is a tendency to laser in on a set of skills and max them out, that really is not necessary. The same is true for Spot as far as I can tell. My own experience is that Spot is incredibly useful in seeing hidden mobs. When it is high enough for that purpose it is often high enough to get the warning signs that a trap is near.
Keep in mind that Spot is a WIS based skill. You probably are not investing in WIS as a rogue. You may not have the gear slots to add a WIS item. So, although Spot is a class skill, you very well may not ever spot anything (unless it is incredibly easy due to quest design -- like the secret door in Catacombs).
This means it is very useful to have along your barbarian trap finder whenever possible.
OTOH, if you have the skill points go ahead and invest in Spot. I ended up with a very nice Spot on my assassin. But, I followed the INT based build and that gives an over abundance of skill points. You might not have that with the build you are planning.
This is the bottom line and great advice.