Hello sifus, can recomend me an upgrade pls,

Current : 1000d + 18-55 (kit lens) + 50mm 1.8 + YN 560

can recomend me upgrades? shud i went to upgrade flash to 430 ex, or went to tamron 17-50mm 2.8 or canon 17-85mm or such? budget around RM1.2k only. but willing to hold a bit if much recommend to upgrade to canon 17-85mm 2nd hand.

Im more like of shooting potraits group photos in small2 events. Thanks.
thanks.