Duck:

There are downsides to dynamic addresses.... You can't get to your own stuff so easily from other locations because you don't know the IP to connect to is a biggie.

The point is that if all you can do is DoS me because my IP is static then what's the problem... ID the DoS, call the ISP and as them to block it or cjange your IP..... How hard is that? Any other kind of attack should be patched/blocked/mitigated anyway!