The R9 is great but is rare and IMO overpriced becauseof it's rarity. It is a high quality gun but it's not worth the price. But people willingly pay it so I guess the market deems otherwise. The NAA is will made and feels solid (read: heavy) the other choice is the new kahr 380. From what you listed it is the only one I would consider. The micro eagle is heavy and the trigger feels cheap to me. FWIW the main purpose of a pocket pistol os ease of carry and you can't get easier than the lcp or keltec. I had a p32 jam-o-matic and swore off pocket pistols. Then ruger released it's lcp and I was brought back into the mousegun world. I like the lcp it is well made and does what a mousegun should do. Function reliably at close range. I use the hornady critical defense and have had no problems in over 500 rounds after the first hundred rounds of cheap break in ammo.