I see that you have already bought / settled on something .. however for anyone else in the future hopefully the information is useful as well.
When looking into a switch, have a look at what their overall switching capacity is between ports. Most of the cheaper end switches will have a very low rate, thus when you start to load up the switch your over all port speeds diminish.
Most of the above switches have decent switching capacity, however as indicated noise could be a problem with some of them.
Another brand taking a look at is the HP ProCurve 1800 Series (
http://www.hp.com/rnd/products/switc...s/overview.htm)
Their 24 Port unit has a zero dB acoustic value as it has no fans - and supports quite a good variety of features.
Also - it has a lifetime warranty - I know some people say switches rarely die, but I have personal experience of switches / ports just die in production / server rooms so to have this as standard as part of the purchase is a pretty good insurance policy for peace of mind.