I have had the 26 since they released the little buggers. Sold off my S&W compacts after aquiring the 26.
Keep the 26. Add the magazine grip extensions, and tritium night sights. Believe me, with the grip extensions and night sights you will have a whole new gun in your hand.
If you want a larger pistol go to the 34, and get an appreciably longer sight plane.
IMHO, if you need a compact pistol, use the most compact one you can get (26). If you need/have room for a full sized pistol, get a full sized pistol (34). To me the G17 and G19 don't fill a niche I need.
I am a big believer in the saying "the best self defence gun is the one you have with you". The G26 ends up with me when I would otherwise be pared down to a .38 snub or nothing. If I have the room for a full sized gun I want a full sized gun (1911 .45)