Need advice on best setup for Extreme and Express w/ (n only) network

I'd like to get some advice on the best setup for my situation. I've read a number of posts on WDS, Extending a Network, etc. and, unfortunately, I'm now more confused than ever.
We have an Airport Extreme 802.11n using WPA2 Personal, 2.4Ghz (n only connection) which I've found to give us the best range/connection speeds for the following devices (all computers running 10.5.5, Apple TV's using most current update):
(2) MacBooks
iMac
(2) AppleTVs
The good news we have a large house, the bad news we have a large house. Meaning of course that I don't get the range in parts of the house I'd like to. I also have an older Mini (G4) connected to the AEBS thru ethernet (the Mini acts as the iTunes server for the ATVs).
I just bought a new Airport Express with the desire to place it on the other side of the house to both enhance the range of the wireless network and to provide another wired to wireless connection to the network.
I initially merely chose to "Extend a wireless network" but that seems to have a MAJOR adverse impact on the speeds of the wireless network. dropping the streaming to one of the ATV by like 90%. I would like to maintain the security settings I have as well as the 2.4Ghz (n only) since these provide the best speed/connection range on the AEBS.
My question then is what is the best way to use the AX (WDS? Bridge?).

The best way to use it is the option you chose "Extend a wireless network".
WDS forces you to the much slower 802.11g and even cuts that bandwidth in half.
Operating as a bridge has nothing to do with wirelessly extending a network. Changing this option won't have any effect on wireless bandwidth.

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