IMO I think the networking track will suit a computer security professional much better. You will have a greater understanding of how and why attacks work. The programming side will just help you more in developing applications and possibly security tools. In order to make security tools, you are going to know networking inside and out.

I am also taking a Computer Networking degree and it requires us to take several programming classes. At my school, there is only like a 4 class difference between the two programs. You may want to look at the differences in the programs and see if your programs are similar. If they are similar, you can always go back for the programming degree too.

If you take the networking route, it will be much easier to get some other certs too. Some of the classes that are required for me will basically walk me through Ciscos's CCNA cert. All I'll have to do is go take the cert this summer.

Whichever route you choose, good luck!