Small venue music gig, hire a lens?

[chphoto]

I'm going to do some gig photos this Sunday, my current line-up is:

Canon 400D
18-55mm
50mm f1.8
70-200mm f4L

Would it be worth trying to hire a 17-55mm f2.8 or a 35mm f1.4L? The 18-55mm works, but the images are (obviously) lacking in quality compared to the 50 and 70-200.

It will be my first proper attempt at gig photos, so do you think it would be best to give the 18-55mm a chance?
I expect to be able to get fairly close to the stage as it's only a small venue. Not sure about flash usage, I'll check up on that

 

[magicaxeman]

It's my betting the 50mm will stay on most of the time.
If you have a bit of cash to spare you could try picking up a tamron 17-50 F2.8 non VC version to replace the kit lens, that would give you some more options, but still stick the nifty in your pocket.

Theres one going here.. http://www.talkphotography.co.uk/forums/showthread.php?t=255101