Um, wait for A. Unless you want either a repeater or an access point on any room of stone or block or brick walls or very thick insulated wood or every room built with steel wall risers. The current fastest that is more economical does not have a good wall panetration freq set avlaibale to it. This makes it both the most secure and frustratingly the least able to work well in a many-roomed "home." One way around this is a mixed-mode net, with multimedial (wireless plus hardwired access points that are hard wired to each other or to a trditional switch to eliminate the extreme signal to distance and density loss of the current fastest economical wireless). Probably it is also the best economical way to deploy at first too, to see where you DO get signal loss in reality. Switch a room over, then use a laptop and measure rates from other rooms. A fiber backbone would be best right now, next best would CAT 6 Sheilded, or CAT 6 Plenum -- your backbone will determine best flow from one end of faciltiy to the other, and G's is weak due to signal attentuation as opposed to base speed. A's has a security problem, it might be a tib too robust unless your site has very thick and dense outer walls.

So, would tell your boss that things need to be staged for this kind of change to balance the need to keep private code private and have good speed that is relaible. I have known folks to tell me that they had to buy 4-5 times as many repeaters with G deploys as they figured on. These folks work in hospitals in my area, and they need secure installs with very relaible data flow-- they run gateways wired to remote antennae in each room and every 50 to 100 feet in halls for laptop or remote terminal use in rooms and in halls, and the backbone is CAT 6 Plenum for long runs with critical flows and CAT5E for non-critical run with Fiber for anything from building to building.

I am not a wireless guru per se, but have talked to very heavy site admins for 3-4 story hurricane hardened hospitals and toured hospitals with them. They have been known to wire admin with G and other places with A just to handle interference and other problems, but most of them use G with lots of romm and zone antennaes hooked to repeaters and gates that concentrate repeater signals, up in drop ceilings. Where they did not have dropped ceilings they used CAT 6 or fiber depending on priority and distance and hickness of walls. One gate should prove this, with a laptop to show hoe signals actually decrease in your facility. "sniff it yourself," for G, is the best way to go. You could do two laptops, put one gate on a cart, move from room toroom,and see where signal dropouts are, with BSD or Linux if the laptops are speced right, and with one desktop on a cart and the gate on same cart if the budget only runs to one laptop.

TECHNICALLY, you could use TWO carts and two desktops(one per cart), but a big UPS that could power a small basic PC fora couple hours might be a problem to get on the moving and sniffing set of gear. If you have to, tell him a real good security survey would cost more than one laptop. It would be quite true.

A good G-capable PDA that can hotswap main batteries with 5-6 spare batteries (rechargable) would substitute for a laptop for signal propagation mapping along with plans of building, laptop would be more robust to network troubleshoot the whole thing in the long run.

I do not know if a Fluke Netrunner can be made G-capable without a gateway for itself and a UPS to power the gateway. I DO know those are "worth their weight in Gold" for network fixing very quickly and with less network-trained folks. A Netrunner is a network mapping thing, that can measure and show signal loss. If you can beg borrow, rent, use one for a day with a G gateway and an A gateway and a lappie with a couple different media wireless things and drivers, you can range-and-signal-loss-map the building in about 12 hours of work unless it is radically huge and that will save him very possibly doubling his costs if no such thing is done and you do it as you deploy, due to rework and extra gear to fill in "holes."

I am on the wrong continent to do that job,but you NEED a signal propagation map and having one will let you tell exactly what is up if you have a laptop or wireless capable device to verify map with later and extend or change it as needed.

Good Luck.