The only thing I'd caution is saying "she'd be too good if you get xxx item." Well ... that's the point of items. To improve your champion. Some items just plain work better with some champions than others.
Besides that, as a consistent Fiora player top, I like the changes. I think combining Riposte and Lunge increases the skill cap on playing her which is always nice. Timing both effects will be interesting. I'm a little torn on switching the Burst of Speed effects because I don't use it for a speed boost, I use it as a quick hit and run tactic. It's not that I can't get in and out fast enough, lunge works great for that. But if I only get 2 hits instead of 4 in because her AS needs to 'charge up,' it becomes much less effective as a harass tool, and it also makes her passive less effective as well.
Overall though, well done. Those are only minor quips.