AirPort, older AirPort Extreme Base Station, AirPort Express, Newer AirPort Extreme Base Station

This may sound like a fairly dumb question, but here goes anyway:
I have a 27" iMac with the following AirPort Extreme card:
Card Type:    AirPort Extreme  (0x168C, 0x8F)
Firmware Version:    Atheros 9280: 2.1.14.6
For a Base Station, I'm currently using a pretty long-in-the-tooth M8799LL/A AirPort Extreme Base Station (with modem and antenna port)
I recently bought an Airport Express:
AirPort Express MB321LL/A (A1264) to
A. Use AirTunes to send iTunes from my Man Cave on the first floor at one end of the house to the family room on the first floor at the other, where it will connect to an A/V setup, and, probably, one of my USB printers
B. Act as a repeater for the AirPort Extreme Base Station, which is physically closer to the Man Cave than to the family room. My wife and I use our ancient-but-hangin'-in-there iBook G4s in the family room (and upstairs) to check email, eBay, etc. Both in the family room and especially upstairs, we sometimes get only 2-3 bars on the AirPort signal strength indicator in the menu bar.
I see that I can get, from a well-known third-party retailer, an AirPort Extreme 802.11n A1143 (1st Generation), for an exceptionally reasonable price.
My question is, what would getting the AirPort Extreme 802.11n A1143 do for me, if anything? I know it would give me one more signal source in the repeater chain, and I could probably put the Auld Nyle M8799LL/A in the stairway or upstairs to boost the signal upstairs, and I could use the USB port in the AirPort Extreme A1143 for connecting another USB printer or USB external hard drive (would this drive be available to any Mac on the AirPort network?)
Any other configuration possibilities and suggestions greatly appreciated!
Peace & Love
Bart Brown

Thank you for the prompt reply and the very helpful links. I'm going through all the support docs right now, but from your explanation and what I've seen in the support docs so far, it would appear that the maximum bandwidth is achieved by a physically-connected "Roaming Network."
I'm so out of it, I'm afraid I'd never heard  of "Powerline adapters," but I looked them up, and I guess this is the system that uses "Romex" - style standard house wiring to carry signal, which cuts down on each individual Base Station's power overhead (does it also affect bandwidth?).
I see a lot of names selling these adapters -- Western, D-Link, NETGEAR, ZyXEL, Monster, Sling Media, PowerNet, Cisco-Linksys, Actiontec, Medialink, Rosewill, TRENDnet -- and a lot of different configurations: 1 port, 2 ports, 4 ports. Basically I have one 27" iMac that doesn't go anywhere (it's not too portable!), a couple iBook G4s, and a point where I want to run 1/8" mini-jack-to-RCA L/R audio cable from the AirPort Express to an A/V receiver. I doubt this configuration is going to change, as I'm 63, and too lazy to lug stuff around if I don't have to. What do you think would be the best solution for me, considering I just ordered the AEBSn and I already have a brand-new AXn. Should the 27" iMac, since it ain't movin', be connected by ethernet/"Powerline adapter", rather than relying on the internal Airport Extreme card? I guess what I'm asking is, given what I want to do, how many of these Powerline adapters, what kind (do you recommend), with how many ethernet ports do I need?
Thank you again for your prompt and informed help.
Bart Brown

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