I definitely wouldn't connect your server to wireless. Extenders on the other hand can work if you do the following.
Use 802.11n over the 5Ghz band. Less interference from other wireless networks, cordless phones on the 5 Ghz band and the 802.11n can supply enough bandwidth to stream DVDs and some broadcast high-def content (19Mbps or less).
Dedicate the 802.11n network to streaming, do not have your PCs on it for just day-to-day "data" stuff. I have also found that connecting devices to a bridge such as the Dlink DAP series is better than a bunch of devices connecting wirelessly themselves. The more wireless devices on the network, the greater the overhead of the wireless protocols. For example, I had the Popcorn Hour and the DMA2100 extender in our bedroom use separate wireless adapters to connect to the Dlink DAP-1555 in the computer room. When I connected both the Popcorn Hour and the Extender to another DAP-1555 running in bridge mode, the performance of the DMA2100 was greatly improved.
Also, do you have a Cable TV outlet where you want to move the server? IF so, have you looked at MoCA to bridge the Ethernet over the Coax? I have installed it to connect the Media Center PC here in the computer room to my XBOX 360, PS3, and Toshiba HD-A2 in the living room and it works much better than the 5 Ghz Wireless-N did.
-- Jim
Velocity Micro Cinemagix (Q6600 CPU, 4GB of RAM, Nvidia 8600, 3TB of storage) running Windows 7 Ultimate x64
2 ATI Digital Cable Tuners / 1 HD Homerun (2 QAM tuners)
1 XBOX 360 Elite, 1 XBOX 360 Halo 3 Edition, 1 Linksys DMA 2100
XBOXs connected via MoCA
DMA 2100 connected via 802.11n 5Ghz
Charter Communications / Bay City, Michigan Headend