Can't go wrong with the 50, I have one and it does come in handy especially for the price. For a decent carry around lense look at a sigma or tamron around a 28-75 F2.8. Can pick one up for around $400. Good carry around and the 2.8 will help in low light situations. The 28-135 is also a decent carry around lense with good range but is limited with the F stop only going to 3.5 at 28mm.