What can you suggest I purchase/maybe return

/etc? What would be the networking process (wireless vs. hardwire).
Hi there. Here's our home network setup:
Optimum (Cablevision) Cable Modem - Motorola Surfboard
Linksys/Cisco E3000 N-Wireless Router
Western Digital Caviar Green 1 TB Hard Disk in Rosewill Enclosure
HP Laptop, Wireless (N)
iBook G4, Wireless (B)
Windows 7 Desktop, Wireless (N)
iPod Touch 1st Gen
iPhone 4S
iPhone 4S
Nintendo Wii
HP Officejet 6509n, Wireless (Not e-print)
Apple TV, Wireless.
Due to the way the cable enters my townhouse, I'm very limited in terms of cables, and actually have about 25 feet of coaxial cable tacked down to my baseboards to connect to the TV. It's a physical limitation of our location. I have had no problems with this setup, though I will admit I occasionally (maybe once every 6 months?) have to restart my router because the printer gets funky.
The WD HDD is connected to my router, because I want all my computers/devices to have access even when the desktop isn't turned on. I sacrifice speed overall to have the accessibility, but at least it's wireless N speed, which is noticably different for intranet file transfer between my computers.
I like this setup a lot, and I'd obviously like to put more Macintosh computers in there, and I'll be working on that as the rest of these pop.
I really like the interface of the ATV3 and I'm pleased with my purchase. There are some limitations that I'm willing to deal with for the simplicity. All of my media files are in iTunes anyway, so the whole debate above about converting the files to an appropriate format isn't applicable; I use Handbrake as necessary.
I didn't intend to use the Hard Disk on my Router, which is why I didn't buy a time capsule. Otherwise I would have, it's a bit cheaper than doing everything separate, and it's integrated into one device which saves power and space.
Honestly I wouldn't change a thing. I like your setup, it's very comparable to ours.
Unless you didn't have a wireless printer, I find that quite handy. But that's your own opinion.
Enjoy.