Are there any tools to simulate/gauge DPS?

[frefaln]

I know the topic is as old as dirt, but there is so much misinformation out there on old-school message boards when it comes to offhand delay/damage and how it all adds up.

The one story (apparently wrong): offhand delay doesn't matter. Some take it further and suggest that offhand delay is on its own timer and weapon delay has nothing to do with it.

The other "official" story: offhand delay works just like primary delay, except with offhand delay it does a Dual Wield check first and, on success, will swing.

I'm adopting the latter story as the truth, but I'm still grappling with a decision. Currently my primary is Burning Rapier, 7/20. My offhand is Gloomwater Harpoon, 9/31 (both dmg bonus 3).

For every argument I see that suggests I should always put the fastest weapon in my primary (which makes sense to me), I see others suggesting that rogues always want to leverage higher-damage weps in primary for the backstab.

I know it's "pretty" to have bigger numbers on the backstabs but I'm not interested in wow'ing anybody. I just want to make sure I'm being the most efficient DPS contributor I can be given what I have. And this long rant said, all I really want to do is find out if there's some kind of known, proven, acceptable tool outside of EQ that predicts DPS based on a given configuration?