You can go for 24, 28, 30 or 35 focal lengths. They're "normal" lenses for APS-C. If you can get a good "new" 28mm F1.8 (something manufactured just recently), I think it's worth the money. As you know, the reviews for this lens is mixed bag. The Sigma 30mm F1.4 is good but it's not an FF lens. The new 24 and 28mm F2.8 IS lenses have very good IQ but still a little bit expensive. If you can afford them, it's worth going for them.