Low ISO at night should only be used on a tripodt - handheld you probably need higher ISO in order to get faster shutter speeds.
IS = Image Stabilizer. It helps getting sharper images handheld - so it's not needed if you use a tripod. Longer exposures are getting possible.
The aperture of "at least lower than 2.8" is needed handheld as well - not on a tripod. The lower the number the shorter the shutter speed.
The 10-22mm lens is a zoom lens - the widest angle is 10mm. But it can only be used on cameras with crop frame sensor (smaller sensor than full frame; meaning the corners of the pictures are "cut away"). With Canon's crop frame sensors the crop factor is "x1.6". So if you are using the 10-22mm at 10mm you get a focal length of 16mm. Another example: The 18-55mm starts at about 29mm and ends at 88mm.
This lens is suitable for night shooting on a tripod or if you can manage to shoot handheld at shutter speeds of not less than 1/10 (or better 1/20 or higher) of a second.
If the camera is on a tripod the shutter speed doesn't matter if you are shooting still objects. It always depends on what you want to shoot and if you want to do it by hand or if a tripod is OK.
For that picture I used an aperture of 11 and ISO 200, exposure time 30 seconds:
You don't need IS, high ISO or an aperture of 2.8 for that. With that aperture of 2.8 the picture definitely wouldn't be that sharp - but you could blur the background very nice - so that's nice for portraits.
Shorter answer: If you are shooting moving objects you need faster shutter speeds - you probably don't need a tripod for that. That means higher ISO and wide open aperture (2.8 or even 1.8 or something like that).
If you are shooting still objects you can use a tripod and don't need that big apertures or high ISO.
So if you need the faster shutter speeds and higher ISO you should take a look at the Nikon D7000 which can handle high ISO (especially above 1600) quite a bit better as you can see here:
http://www.cameralabs.com/reviews/Nikon ... JPEG.shtml
The result at ISO 6400 looks pretty impressive on the D7000 compared to the EOS 60D. And man - it's a 100% crop!