Hey guys, I'm wondering if any of you uber rogues can help figure out what the best rogue endgame combo of weapons is best for raid DPS

I'm using this spreadsheet: http://rogue.bleedo.net/

judging by its results, the best weapons I could get (which is what I'm using) are a Gladiator's Right Ripper and a Gladiator's Shiv (with 5 points in fist spec, zero dagger spec)

this strikes me as odd though, since it says the gladiator's left ripper is a downgrade in DPS, and it also said that going 5/5 sword spec with the gladiator's slicer/quickblade is a downgrade in DPS

I doubt this is going to be seen as a viable thread. But you should use the search function and look into the Rogue DPS thread, even though it's really long, there's also a lot of useful information in there.

Wrong forum, try the Class Theorycrafting forums. Also, try searching first.