I suggest you use WPA2 or WPA, but this would depend not only on what your wireless adapter supports, but the lowest encryption supported by the other wireless devices or computers in your network. On most cases, you might not find the word WPA as in some routers, they call it as Pre Shared Key or PSK. Also there are those for personal, enterprise, radius etc, just select the one for personal. I had the same problem once but the guys from a support number I called before helped me out and even taught me a few info about it, if you want live assistance in setting your new router, maybe you can try this number 1-877-787-8749, forgot their exact name, suptrix of some sort but I now they could help in some way.
regards,