For the pilot figure the choice is really easy
the one with the BIGGEST Boobs of course.
Actually I think they come with the pilot figures nowadays - one male and one female.

I rarely use the clevises that come with the kits and am fussy about what control rods I use. The largeish surfaces on the tail could possibly overcome the control rods if you are going fast - I make up my own rods by using some normal wire rod and putting a length of small carbon fibre tube on it then filling it with CA - you end up with a rigid yet light rod.

Having said that Seagull tends to have reasonably good hardware with their kits and i know a lot of people that have built many of them and just used the standard hardware and settings.

All the usual stuff like servos, battery pack (I replace mine every year or so just for insurance) and switch (I rarely use switches from one model to the next - especially as the old model has usually been crashed) I prefer to use a switch with a charging jack built in for simplicity. You will also need a couple of servo extension leads to allow you to remove the wing without having to access the receiver each time. - Depending on which version of Spacey you get, (Some had a single wing servo - the later ones use 2 wing servos) and whether or not yoou are using flaperons you may also need a "Y" lead and a couple of 6" or 12" servo extensions.

Like most ARFs these days the kits come complete with pretty well everything you need.