Hi Geoff,
If budget allows, have a look at the (J9146A) HP ProCurve 2910al-24G-PoE+ Switch which gives extra power.
Either way, watch out for the PoE. If you are going N standard wireless, on alot of vendors kit you will need a PoE+ port to run the AP's (new standard 802.3at as appose to the older 802af), as they draw more power, therfore you may need a PoE+ switch.
Again, I can only comment on the HP stuff. If you buy a dual radio AP, you only need a PoE+ port if you are running both radio's at N standard. If you are running your b/g laptops through one radio, and you N's through another, you are still fine with normal PoE.
Seriously....go N though....300Mbps to each laptop!....it's magical!