Chad,

If you're doing well on the trainer, then the 4* is pretty tame. However, it is an easy to fly intro. to low-wing planes, its just a bit boring for my taste. I've not flown a SE, but it seems to be fairly capable and might be good as a second plane. It can be setup to be fairly wild, but with its low wing loading I would think that it should be very manageable with reduced control throws.

I'd save the F-15 for plane #3, and the F-18 or CBM F-16 pusher for plane #4. The prop jets are going to be quite a bit faster than what you're used to and more of a challenge to land, and in the case of the pushers, take off. You need some more experience in handling those aspects before tackling the pushers.

Bob