The Speedy Lightfeet let you double dash for an extra d8 lightning damage on your next attack, and the Whispering Promise lets you use a healing potion with one BA for an extra +d4 to attacks and saves. The Short Sword of First Blood in offhand means you can get behind a target, offhand attack for d6+d8, then crouch and sneak attack for 5d6+4.
Sadly the Speedy Lightfeet is medium Armor. So unless you take the Feat for Medium armor you no can be wear. There are a lot of other good booty options for the rogue though.
I would suggest the Linebreaker Boots, which give you Wrath (+1 damage) for 3 turns when you Dash.
Or Mystra's Grace for feather Fall ability which can be used as a BA.
