The Pro Angler is HUGE... its like the aircraft carrier of kayaks and weighs in at almost 100lbs. But the drive system is awesome. I personally like the Native Ultimate 14.5 with the foot drive thingie. It is like a trolling motor that is driven by bike pedals. The advantage being that you actually have reverse, and the hobie does not.
As for the PFD requirement, it seems that most kayaks fall in the Class A category of boats, which is anything that floats under 16 ft (301 KRA 6:001 Sec 1 (3) ).
301 KRA 6:020 Sec 4 (2) : States that operators of Class A vessels have to have a Type I,II,orIII PFD for each person on board.
The section on signaling devices only pertains to to Class 1 and up vehicles.
The section on Lights simply states that you have to have a white light that can be used in "sufficient time" to prevent a collision. So if you night fish in a canoe or kayak under 22' long all you need is a high powered flash light to be legal, but i would use a pole light.
I found all my information here. Keep in mind that Coast Guard regulations may be stricter if you are on a federal navigable waterway.
http://www.lrc.state.ky.us/kar/301/006/020.htm