New here, but have lurked in the past for a bit. Have done a bit of searching/googling on the subject, but nothing quite specific enough.
Recently got myself a 60D and currently have the Canon 18-135IS that came with it, a Tamron 10-24 and a 'nifty fifty'.
I'm considering something a bit wider than the 50mm, but still good for darker scenes.
Primarily I'm heading to Glastonbury in a month's time which has loads of night time photo opportunities (ie like this,and this and a lot more I didn't even try).
However, it'd also be useful for some photography and video for a mate's a band which is playing at a festival the week after.
I definitely need a reasonably wide angle as there's often no chance of standing further back to encompass everything desired in a shot.
I've been a bit disappointed by the bokeh available on the Tamron for general shots (pets and people etc), so that's part of my drive too.
I'm considering the Sigma 20mm F1.8 which receives very mixed reviews. However, it may be the case that a softer image at F1.8 is better than no image at F2.8.
Also been looking at the various F2.8 17-50 stabilised options.
For most shots the stabilisation may not make much difference - but see it could be useful. However, if we're down to F2.8, we're not that far off the F3.5 of my 18-135IS at the wide end.
As you might work out from my current selection of lenses, I'm not entirely bothered by absolute quality, but obviously want to end up with the opportunity for nicer pics than those I was taking with my LX3 in the last couple of years.
Recently got myself a 60D and currently have the Canon 18-135IS that came with it, a Tamron 10-24 and a 'nifty fifty'.
I'm considering something a bit wider than the 50mm, but still good for darker scenes.
Primarily I'm heading to Glastonbury in a month's time which has loads of night time photo opportunities (ie like this,and this and a lot more I didn't even try).
However, it'd also be useful for some photography and video for a mate's a band which is playing at a festival the week after.
I definitely need a reasonably wide angle as there's often no chance of standing further back to encompass everything desired in a shot.
I've been a bit disappointed by the bokeh available on the Tamron for general shots (pets and people etc), so that's part of my drive too.
I'm considering the Sigma 20mm F1.8 which receives very mixed reviews. However, it may be the case that a softer image at F1.8 is better than no image at F2.8.
Also been looking at the various F2.8 17-50 stabilised options.
For most shots the stabilisation may not make much difference - but see it could be useful. However, if we're down to F2.8, we're not that far off the F3.5 of my 18-135IS at the wide end.
As you might work out from my current selection of lenses, I'm not entirely bothered by absolute quality, but obviously want to end up with the opportunity for nicer pics than those I was taking with my LX3 in the last couple of years.
- some suggest there's just more dodgy batches around than others.
I think it puts many Canon lenses to shame plus you get a hood and a case with it. 

