The 642 and the 640 are good guns. The BG seems to be a little more prone to defects. As far as the LCP goes, .380's are back up guns, not primary guns due to the marginal effectiveness of .380. If the pocket gun is a back up gun, any of the three I spoke about are good guns.

I'd also suggest you look at the Kahr CW 9, accurate, 7 rounds of 9mm, pocket sized and if you shop around, can be bought for under $350.00.

Good luck in your efforts.