Uhh, my answers are the opposite of everyone here. How many of you actually have Integras with a Prokit? *raises hand*.

1. Yes cut your bumpstops. 1/4 off is a good amount. This is only logical.
2. You can ride on stock shocks for a while at least a year. Unless you want to return the ride to a stock feel, stock shocks will last a long long time. I'm running on 18months with stockers. I've known people on 2.0" drops that are fine with stockers. A general rule of thumb is if it's less than 1.5" drop, you're stock shocks are fine. I work on Integras and Subaru WRXs all the time and I've never known of any other case. I'd save the money for the year or so until your shocks blow then get new aftermarket shocks.
3. No camber kit necessary. It's such a small drop, you will waste your money. Camber kits are only necessary on Eibach Sportlines and even then only in the rear.
4. Alignment is necessary but wait 2 weeks for the springs to fully settle in.

Ok Now that your questions are answered, this is what you should do. Install your springs, using stock or aftermarket shocks depending on what you want. Cut the bumpstops 1/4 off. Wait 2 or so weeks. Go get an alignment. If the numbers show your camber is out of recommended range, THEN and only then get a camber kit. Only dumbasses try to fix a problem that isn't there. Do this and I guarantee you'll be fine.

Also I'm on stock LS mesh rims too. I can post pics if ya'll want because I love posting pics. Hehe.