I'd keep the speed too. No sense taking a loss on anything these days unless you have to.
On an unrelated note, I personally prefer the 3. I had a P5 and drove both before trading in. The hesitation issue drove me nuts on the Speed. Plus being married with a kid changes your needs. The 3 with the Nav, leather, HID, ABS, etc.. was just a better choice. I also wouldn't discredit the 3 performance wise either. It handles very well even with the crappy Goodyear RS-A tires on it. I think a good set of skins will make this thing handle VERY well.