So would I. I'm still kinda concerned about the malware breaking out, though. Besides, how would you get the malware to your isolated PC without infecting a non-isolated PC? I can see if you used a VM to DL it, (I.E. KACE) but what if it is transmitted via LAN?
That should not be a problem. Remember, when you are downloading the malware, it is just a file. Many things would have to happen for the other computers to be affected by it. First, the network would need to be using a hub (or a switch acting as a hub), then each PC would have to pay attention to the packet rather than ignore it (since it's not addressed to it). Only at this point could another PC be susceptible to the malware. There are also further steps you can take to further isolate your computer from the network (VLANS, disconnecting all other computers from your network, etc.)