painting the black parts, other options? Options

[914 RZ-1]

So I'd like to paint my car myself and I thought I would practice on the top, front and rear valences, and rocker panels first. I've sanded and painted small models, but nothing as big as a car. I'm taking them a few pieces at a time.

I've researched and seen the posts about the type of paint and getting the texture right. However, I'd like to use a spray gun, not a rattle can, since that's what I'd like to paint the whole car with and want to get a feel for using it. So, I'm thinking I'd get some sort of texture paint to apply the texture, then go over it with a spray gun.

1. What texture paint gives a finer texture:
a) Rustoluem Hammered
b) Line-X (seems like this is really thick and rough)
c) undercoating (is this the stuff made by VHT?)

2. What kind of paint can I spray over the texture coat for the final coat? I'd like satin black, but want it to last. The car is garaged, but I'd like something durable.

I do NOT want to do a gel coat and have to mess with having the gun spit out the right texture (like McMark did. That was bichin' paint job, by the way!).
I do not care if it matches the original perfectly, I just want a slight texture to hide the inevitable scuffs when I remove the top and put it in the trunk.