WLAN...Dual Radio AP's?

We are a school District just getting into the wireless, but we will be purchusing a huge amount this year. We have done site surveys with older 3Com AP6000 802.11b and it worked great but we have also been looking at the new Cisco 1200 series dualradio AP's. Whats everyones opinion on this? Is it better to do pay the extra and get a Dual AP with just the 802.11b for now in hopes of 802.11G? and still be able to use A if needed?

Thanks