It sounds like you just need a break from the P30. Nothing wrong with that and the Glock is as good a platform for it as any.
Hate to tell you but for small hands, the answer to your questions is a Gen 4 G19.
Sights are pretty personal. The Glock brand night sights are, I believe, made by Meprolight. They are OK but personally, for basic night sights its worth the extra $20 for Trijicons or Ameriglo's which use Trijicon lamps.