[alexharrison101]

i have the 18-55mm IS kit lens for my canon 1100D. is it worth upgrading this? i'm pretty happy with it tbh, but a friend of mine has recommended the 17-55 2.8...at the moment this is well out of my price range, but i should be getting some compromise agreement money from work at the end of may and am wondering if this would be a good investment? the Tamron AP AF 17-50 is a cheaper alternative...(just under £300 as opposed to £750 upwards).

i currently have a cheap 70-300 and a nifty fifty alongside the kit lens, and my other upgrade decision is dumping the 70-300 (it's the tamron Di LD Macro which i was talked into when i bought the camera - turns out it is quite limited :/ ) for the much better Tamron 70-300 SP AF Di VC USD. i can pick that up for just under £300.

advice? help!