My first ever firearm purchase was a Benelli M4. I had considered a simple pump action gun but really feel the semi-auto was a better choice. My friends tried to dissuade me saying it would be prone to misfeeding. I asked if they had ever short cycled a pump action and that usually shut them up. I'm saving up right now for a 357Mag revolver as my next purchase.
I had discussed my choice with numerous friends and we determined that firearm selection is at least partly based on who you are more afraid of; President Obama or Burglars!
Scenario #1 Obama: My first choice was the tactical shotgun (Likely to be restricted along with AR15 and AK47), My second choice will be a high capacity semi-auto pistol (same reasoning), and third choice is the revolver as it is the least likely to be restricted.
Scenario #2 Burglars: My first choice would be the revolver. It's simple to use and less likely to cause problems for a Newbie like me. If it doesn't go bang, just pull the trigger again. My second choice would be a simple pump action shotgun. The Keep It Simple Stupid (KISS) doctrine applies. My third choice would be the semi-automatic pistol. My limited experience so far has proven me to be unreliable (notice I said me, not the gun) with numerous FTFs.
Looks like I was initially more afraid of impending gun legislation than burglars and now I am correcting course. All that being said I plan on purchasing all three and practicing with all of them regularly.