All the front springs are the same color. You'll need to hit them with a digital caliper to see the wire gauge, which is how they're measured. While you're measuring, check the uncompressed height as well. If they're off by .25 mm it may be wise to replace them as one of them is probably blown and the difference is more than you'll want to correct with shims on the kingpin. The thinner springs will go bad quicker than the thicker gauge springs will.

The toe in doesn't sound bad as a starting point. You can start with -1 degree camber and adjust from there as the tires begin to cone. You'll have it spot on when the tires wear flat for the track you're running on and you can carry the greatest corner speed.

If you've got camber set properly, you shouldn't have to true the tires that often. You'll need to cut them even less if you rotate left to right every heat or two. Front springs and center shock changes will affect the optimal camber setting, but you won't know which way to go until you run the car and get inside/outside tire measurements to correct from.

I would plan on the fronts wearing more quickly due to the cornering forces that act on them and the fact that the tire is smaller to begin with. As the fronts wear, you'll want to change the lower arm mount shims to keep the desired ride height. (You'll do the same in the rear, but less frequently.)

I would think in this case it would be beneficial to stick with the AE front end kit. Parts are widely available, cheap, and it's an excellent front end assembly.

Hope this helps!
Chris