Sigma 28-300 mm

[alfik]

Hi Guys!

I need ask for some information ?
I have Canon EOS Rebel XT with lens 18-55 mm and i want to buy better lens,
somebody has Sigma lens for sale (28-300mm 1:3.5-6.3 ) for $150 CDN
I think that glass is little to heavy for my camera but is for sure better then my smaller
lens
What do you think??