Here, you don't need to buy a second NIC to do what you want. If you use an addressing scheme like this, everything should work fine.
You will need to assign a secondary IP to your NIC. Here's what you have to do :
Firstly, configure your rogers router to use 192.168.1.1 as a static IP address. Depending on the model of your router this step might be a bit different. Use 255.255.255.0 as the mask.
Then, on your PC, open the TCP/IP (IPv4) settings and select this :
IP: 192.168.1.2
Mask: 255.255.255.0
Gateway: 192.168.1.1
Click Apply.
Without leaving the TCP/IP settings, click the Advanced button.
On the IP Addresses section, you'll see the IP you've just configured. Click Add, then put in :
IP: 192.168.2.2
Mask: 255.255.255.0
Do not add a gateway, click Apply then close.
Next, give the following IP to your teksavvy router (yadda yadda about every router being different).
IP: 192.168.2.1
Mask: 255.255.255.0
Then, on you media server:
IP: 192.168.2.3
Mask: 255.255.255.0
GW: 192.168.2.1
In advanced, add this IP :
IP: 192.168.1.3
Mask: 255.255.255.0
Do not add a gateway, apply and close.
Voilą, two separate internet WAN links.
Hope that helps, if you have any question feel free to ask.
Edit: please ignore the 169 addresses in the graph below, I was typing a bit fast I think.

They should read 168.