you must be on budget..me too canon 500d....
if i rem correctly i got it 2mths ago at MS close to $499 for the sigma 18-200 DC(non os)...from far look like L lens cos got red ring!haha...much shorter and lighter compared to sigma 18-125 , and 18-200 os...tried all at MS....at this price can't complain too much as a walkabout outdoor lens...
ideally i would like to own EF-S 10-22(still procrastinating), already got tamron 28-75 f2.8, and also aiming prime 85mm or 100mm to complete what i think i need.........(got 50mm f1.8 and 18-55 kit collecting dust in dri cabi)