How do I change which server to download ports from?

[Robert G.]

I'm not talking about SUPFILE= in /etc/make.conf to change which CVS 
server I download all the ports, I'm talking about when I 
download/install individual ports it seems to pick a random server. 
Sometimes the server is one in another country, and I download a 30MB 
file at 5KB/sec which takes some time (I have 6.5Mbps).  Is there an 
option to change this to a server of my choice?

Thanks.

-- 
Robert G.