91 DPS MH and OH compared to 103 DPS MH and OH...
I'd say your DPS would drop.
Wait, I got that one wrong, didn't I?
Crap.
Incidentally, your question could have been answered
here or
here.
The second link is a rogue DPS spreadsheet, where you put in your spec, gear, and buffs, and it will spit out the DPS you should be doing under ideal situations. Familiarize yourself with it, as if you want to raid on your rogue, it's the #1 most useful thing to have.
Edit: And right about now, 98.6% of the rogue forums are having a heart attack that I didn't flame this poor sod.
What can I say? I had a weak moment.
Edited, Apr 22nd 2008 3:24am by Theophany